Dissertations / Theses on the topic 'Mitsunobu'
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But, Yuen-sze Tracy, and 畢婉詩. "Organocatalytic alcohol oxidation and Mitsunobu reactions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42182578.
Full textBut, Yuen-sze Tracy. "Organocatalytic alcohol oxidation and Mitsunobu reactions." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B42182578.
Full textCamp, David. "Some Aspects of the Mitsunobu Reaction." Thesis, Griffith University, 1990. http://hdl.handle.net/10072/366203.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Division of Science and Technology
Science, Environment, Engineering and Technology
Full Text
Shannon-Little, Andrew Laurence. "Studies towards a phosphorus(V)-catalysed Mitsunobu reaction." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33038/.
Full textLe, Foll Alexandra. "Polymères à empreintes moléculaires : nouveaux outils prometteurs pour la synthèse organique." Thesis, Rouen, INSA, 2010. http://www.theses.fr/2010ISAM0006.
Full textThis work deals with the use of molecular imprinting technology for the design of new tools in organic sythesis. First, we studied the potential of MIPs in organocatalysis through activation in the imprints. For this purpose, several thiourea-cinchona alkaloid derivatives have been prepared so as to be introduced in the polymer cavities. The use of different MIPs synthesised with these polymerisable catalysts in Henry reaction did not show any advantageous effect on reaction rate or enantioselectivity. Secondly, we have prformed the development of a strategy for separation and recovery of a wide range of compounds by relating tag technology with molecular imprinting. Efficiency and selectivity of MIP-Tag for in triazole series have been demonstrated. Tagged tyrosine has been selectively extracted from an amino-acid mixture. Then, the application of this Tag technology for the recovery of pybox and proline catalyst was investigated. Finally, we have demonstrated the efficiency of our process for the removal of triphenylphosphine oxide formed during a Mitsunobu reaction. The removal of 99% of tagged phosphine oxide was perforrmed by the purification of a reaction medium in SPE by means of MIP-Tag
Thompson, Stephen. "The synthesis of novel DNA-interactive pyrrolo-(2,1-c)[1,4]-benzodiazepin-5-ones." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367072.
Full textSallas, Florence. "Méthodologies de fonctionnalisation directe, étude structurale et physico-chimique de nouveaux dérivés de cyclodextrines." Nancy 1, 1996. http://docnum.univ-lorraine.fr/public/SCD_T_1996_0398_SALLAS.pdf.
Full textFelten, Anne-Sophie. "Synthèse de N-aminopeptides. Application à la synthèse de nouveaux foldamères." Thesis, Vandoeuvre-les-Nancy, INPL, 2007. http://www.theses.fr/2007INPL095N/document.
Full textThis work describes the synthesis, the oligomerization and the structural study of N-aminopeptides. By extrapolating an original strategy of hydrazinoacids synthesis developed in the LCPM we were able to obtain N-aminodipeptides in high optical purity in a satisfactory way. These compounds were the indispensable precursors in order to continue the project. We were able to show that the activation of the acidic partner involved in the key reaction of Mitsunobu usually obtained by the use of the phtalimide group, could be advantageously realized by the introduction of a hydrazone moiety with strong electron-withdrawing character. An extension of this method on solid support is a result which constitutes an effective application of a Mitsunobu protocol in Solid Phase Organic Chemistry. The Naminodipeptides thus obtained were studied in reactions of oligomérisation. A preliminary study in liquid phase allowed to demonstrate that a classic peptidic coupling reaction could occur between two pseudopeptidic units. The continuation of the study was made on solid phase and allowed us to obtain the first [alpha-N-amino]peptides never synthesized to this day. Finally, in the third chapter, these oligomers were studied by molecular modelling and various spectroscopic methods (NMR, IR) who allowed to suggest a folding by the establishment of intramolecular hydrogen bonds
Fu, Jiasheng. "Investigation of stereoselection by the Mitsunobu reaction and modification of the Hendrickson reaction." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0009/NQ59960.pdf.
Full textBell, Kathryn Emma. "Advances in the retro-Cope elimination." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307744.
Full textBouillon, Isabelle. "Synthèses d'[alpha]-hydrazinopeptides." Vandoeuvre-les-Nancy, INPL, 2006. http://docnum.univ-lorraine.fr/public/INPL/2006_BOUILLON_I.pdf.
Full textWe have synthesized [alpha]-hydrazinopeptides on liquid and solid phase. We have developed original synthetic protocols for the preparation of chiral [alpha]-hydrazinoacids via liquid and solid phase synthesis. A systematic study was performed in liquid phase in order to define coupling conditions to incorporate the hydrazinoacids in a peptide chain. We have shown that the reactivity of the Nβ seems to be clearly less reactive than that of a classical amino acid and specific conditions had to be defined to form the hydrazide link. By using HRMAS NMR techniques as qualitative monitoring, we were able to develop three strategies for the incorporation of hydrazinoacids on solid phase. Finally, we demonstrated that pseudodipeptides obtained by liquid phase protocol can be oligomerized to give a new kind of oligomers: the [alpha]/hydrazino-peptides
Azzouz, Rabah. "Pyridinols protégés et leur utilisation en métallation. Synthèse d'indolizidines à partir de la pyridine : synthèse d'indolizidines à partir de la pyridine." Phd thesis, INSA de Rouen, 2008. http://tel.archives-ouvertes.fr/tel-00559656.
Full textFu, Yunyi Michael. "Development of a polymer-supported reagent for Trost-Lu isomerization reactions and reagents for Mitsunobu reactions." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B39793989.
Full textFu, Yunyi Michael, and 付運毅. "Development of a polymer-supported reagent for Trost-Lu isomerization reactions and reagents for Mitsunobu reactions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B39793989.
Full textFairfull-Smith, Kathryn Elizabeth, and n/a. "Synthetic and Mechanistic Investigations of Some Novel Organophosphorus Reagents." Griffith University. School of Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040917.081950.
Full textFairfull-Smith, Kathryn Elizabeth. "Synthetic and Mechanistic Investigations of Some Novel Organophosphorus Reagents." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367534.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Science
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Woods, Timothy E. "Elucidating the degree of selectivity for NLO surrogate attachment to model compounds and a co-polyimide using the Mitsunobu reaction /." Online version of thesis, 2008. http://hdl.handle.net/1850/7725.
Full textFang, Fang. "Synthesis of Bicyclic and Tricyclic Analogues of Oxazolidinone." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1357312054.
Full textMartial, Ludovic. "Réaction de Mitsunobu : développement d'un outil pour la synthèse. Utilisation du dioxyde de soufre généré in situ à partir de ses adduits." Rouen, 2015. http://www.theses.fr/2015ROUES041.
Full textThe main objective of this study was develop a convenient tool for the inversion of the stereogenic center of secondary alcohols by the Mitsunobu reaction, with no purification. The use of 4-aminobutyric acid, N-protected with Boc was employed in stoichiometric amount. Only the inverted alcohol, rendered water-soluble owing to the ammonium moiety, was extracted in water and then regenerated via a selective cleavage of the ester by lactamization in basic medium. Secondly, the synthesis of 1,4-diazabicyclo[2. 2. 2]octane bis sulfur dioxide adduct (DABSO) has been developed from a Karl Fischer solution. A valuation of DABSO as a source of free SO2, generated in situ in the reaction mixture by the use of Lewis acids, and various strong acids has been demonstrated by a cheletropic addition with dienes. Finally, besides the protection of other dienes as sulfolenes resulting from this reaction, a "one-pot" method has been developed to generate both free SO2 and the diene in the same reaction medium, from allyl alcohols
Font, Gimbernat David. "Síntesi en dissolució i fase sòlida de nous derivats primidínics amb una alta diversitat molecular." Doctoral thesis, Universitat de Girona, 2003. http://hdl.handle.net/10803/8031.
Full textGràcies a aquesta metodologia s'han preparat diferents 2-amino-4-alcoxipirimidines (7, Nu = RR'N) en dissolució i sobre suport sòlid. Mitjançant algunes variacions s'han pogut obtenir altres derivats pirimidínics:
- 4(3H)-pirimidinones 2,6-disubstituïdes (8, Nu = RR'N, ArO, RR'R''C), preparades a partir de la hidròlisi del grup alcòxid (OR5) dels compostos (7) en medi àcid.
- imidazo[1,2-a]pirimidinones (9 o 10, n = 1) i pirimido[1,2-a]pirimidinones (9 o 10, n = 2). Els compostos (9) s'han obtingut selectivament a través d'una ciclació intramolecular de les pirimidines (7, Nu = aminoalcohols) utilitzant àcid sulfúric. Quan s'han ciclat els compostos (8, Nu = aminoalcohols) mitjançant una reacció de Mitsunobu intramolecular, s'han obtingut els regioisòmers (9) i (10) en diferents proporcions en funció dels grups presents en l'anell.
- pirimidines funcionalitzades amb restes d'-arilglina (11). La funció arilglicina s'ha preparat mitjançant la condensació d'amines (4, R2 = CH2CHR3NHR4) amb àcid glioxàlic i àcids arilborònics (reacció de Petasis). L'oxidació del grup sulfanil dels compostos (11) a sulfona utilitzant m-CPBA ha provocat també l'oxidació de l'àtom de nitrogen de l'arilglicina.
Alguns d'aquests derivats pirimidínics han mostrat ser inhibidors del Mycobacterium tuberculosis.
We have developed an efficient methodology that allows the synthesis of pyrimidine derivatives with a high degree of molecular diversity. We have shown that easily available 2-thiouracils of type (2) can be used as versatile building blocks toward the preparation of substituted 4-alkoxypyrimidine (4) through a simple O-alkylation reaction. The steric effects have a remarkable influence over the regioselectivity of the reaction, both using alkyl halides in basic conditions and with alcohols under Mitsunobu conditions. Optionally, further suitable manipulations over the substituents at the 4-position would enhance the introduction of additional diversity. Finally, oxidation of the thioether moiety to the corresponding sulfone 6 and nucleophilic displacement by different nucleophiles would produce the corresponding highly molecular diverse pyrimidines of type (7).
The methodology developed in solution has been, successfully, transferred to the solid support (benzyl bromide replaced by Merrifield resin). A small library of molecularly diverse 4-alkoxypyrimidines has been prepared in parallel on solid support. The final products, 2-amino-4-alkoxypyrimidines (7), have been obtained in good overall yields.
The study of the nucleophilic ipso-substitution reaction in 4-isopropoxypyrimidines (5, R5 = (CH3)2CH) has been expanded using a wide variety of nucleophiles (N-, C- and O-). The cleavage of 4-isopropoxy group afforded a collection of 2,6-disubstituted 4(3H)-pyrimidinones (8) (Figure 1).
The introduction of several - and -aminoalcohols at the position 2- on the pyrimidine ring and the subsequent intramolecular cyclisation afforded different imidazo- and pyrimido[1,2-a]pyrimidinones (9 and 10). Intramolecular cyclisation of 4(3H)-pyrimidininones (8, Nu = aminoalcohols) under Mitsunobu conditions, afforded a separable mixture of the regioisomeric compounds (9) and (10) (Figure 1). Cyclisation of 4-isopropoxypyrimidines (7, Nu = aminoalcohols) with H2SO4 yielded the regioisomers (9) as the only products.
Fynally, a little collection of -arylglycines linked to the pyrimidinone ring (11) (Figure 1) has been prepared using the Petasis reaction.
Several pyrimidine derivatives have shown inhibitory activity against Mycobacterium tuberculosis.
Quader, Sabina, and N/A. "Selective Synthetic Modification of Aminoglycosides for Drug Targeting to Tuberculosis." Griffith University. School of Biomolecular and Physical Sciences, 2007. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20071024.151619.
Full textKintz, Nicolas. "Synthèse d'amines α-alléniques via les sels d'alcoxyphosphonium issus d'alcools α-alléniques : réaction de Pauson-Khand des alcools et amines α-alléniques." Lyon 1, 1998. http://www.theses.fr/1998LYO10090.
Full textGernigon, Nicolas. "Vers de nouvelles molécules ciblant des ARN impliqués dans la virulence bactérienne : le groupement boronate, un groupement α-directeur pour la réaction de Mitsunobu." Rennes 1, 2009. http://www.theses.fr/2009REN1S136.
Full textThe effectiveness of treatment with antibiotics and aminoglycosides in particular, has emerged as a major problem of public health. This is due to the apparition of multidrug-resistant bacteria by production of enzymes for modification of the antibiotic. One strategy to fight against these phenomena of resistance is the development of new aminoglycosides. The neamine is the minimum necessary to cause the recognition of aminoglycosides by the A site of 16S RNA. During this work, we prepared derivatives neamine functionalized at position 5 and 6, via the use of carbonates / sulfates ring motifs. Their antibiotic activity on strains of Gram + / Gram-was assessed. These first results open interesting perspectives for the future design of more active compounds. In parallel with this project, we are interested in the study of Mitsunobu reactions on vinylboronates possessing an alcohol function in allylic position. The influence of the boryl group on the regioselectivity has been demonstrated, and a sequence of three components "one pot" allowing access to functionalized enamide has been developed
Quader, Sabina. "Selective Synthetic Modification of Aminoglycosides for Drug Targeting to Tuberculosis." Thesis, Griffith University, 2007. http://hdl.handle.net/10072/367086.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Biomolecular and Physical Sciences
Faculty of Science, Environment, Engineering and Technology
Full Text
Hernandez, Linares Angelica. "Hémisynthèse d'analogues aminoglycosidiques dérivés de la Néomycine B." Paris 11, 2003. http://www.theses.fr/2003PA112338.
Full textIn this work we present various routes leading to a number of compounds which derive from natural aminoglycoside antibiotics, namely : neamine, ribostamycine and neomycine B. The design of these compounds rests on the result of recently reported stuctural data regarding the interactions of this type of antibiotics with ribosome 16S RNA. Our objective was the conception of molecules exhibiting a discriminating capacity between human and bacterial ribosomal ARN. In the first two chapters, we have reviewed a number of recent data regarding the aminoglycoside antibiotics. The third chapter is dedicated to hemisyntheses of a number of ribostamycine analogues. In chapter 4, we have attempted to transpose the results of the previous chapter to neomycine B. By doing so, we encountered unexpected difficulties with the application of the Misunobu reaction to this substrate. We have observed a reaction leading to a double cyclisation within cycle IV of this molecule. However, we could develop an alternative route to obtain the desired neomycine B analogues. Finally, in chapter 5 we have evaluated the antibiotic activities of the new compounds against E. Coli. Interestingly, two of them showed promising results
Gurgui, Catalina. "Synthèse et activité biologique d'analogues du nannose 6-phophate : application à l'angiogenèse." Montpellier 2, 2008. http://www.theses.fr/2008MON20094.
Full textHémelaere, Rémy. "Mise au point de réactions tandems catalytiques incluant une étape d'isomérisation pour la synthèse de molécules naturelles." Thesis, Rennes 1, 2013. http://www.theses.fr/2013REN1S173/document.
Full textSome of the new challenges of modern synthetic chemistry are: atom economy, employment of catalytic processes, avoidance of toxic reactants and limitation of purification steps. A lot of work has been devoted to the development of tandem reactions. A new reactivity could be generated in a molecule thanks to an isomerisation (or migration) reaction of an alkene. This reaction often needs an hydride specie which comes from a transition metal catalyst. This PhD thesis is about the development of new tandem reactions in which at least one step is an isomerisation of an olefin. A great attention has been dedicated to the synthesis of vinylboronates especially with a cross-metathesis strategy. These intermediates are of great importance in organic chemistry and can be useful in a wide range of reactions. One of those reactions is the transformation of vinylboronates to allylboronates thanks to an isomerisation step. Allylboronates can then react with aldehydes to generate homoallylic alcohols with total diastereoselectivity. These new reactions have found applications in total synthesis of natural molecules with a 2,3-dihydrobenzofuran core
Gealageas, Ronan. "Synthèse d’analogues de la coelentérazine pour l’imagerie in vivo dynamique des signaux calciques - Synthèse d’analogues du (-)-EGCG comme inhibiteurs de Dyrk1a dans la thérapie symptomatique de la trisomie 21." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112264.
Full textDuring this thesis, two distinct projects were studied: on the one hand, the synthesis of coelenterazine analogs, substrate of several luciferases, in the purpose of using them for in vivo imaging, and on the other, the synthesis of (-)-EGCG analogs, inhibitor of the Dyrk1a kinase, which interests us for the role it plays in the mental retardation existing in the Down Syndrome disease.The problematic of the first project consisted in obtaining coelenterazine analogs that would not only maintain their activity on two luciferases, the Renilla luciferase and aequorine, but they should also induce a red-shift of the bioluminescence produced by these enzymes. Because of its sensitivity to calcium, aequorine was the main biologic target of this project.Seven analogs, of which six had an original structure, were synthesized through usual synthetic methodologies and their activities on both aequorine and Renilla luciferase were tested in vitro, with interesting results: even if the intensities of light emission were weaker than those obtained with native coelenterazine, several molecules produced a red-shift of the emission wavelength of bioluminescence, up to 27nm for aequorine and more than 120nm for the Renilla luciferase. The second project, of classical medicinal chemistry, mainly consisted in the synthesis of epigallocatechin gallate analogs (EGCG) with a simplified backbone and in which the pyranic ring typical of catechins was replaced by a carbocycle. Several molecules were synthesized, two of them possessing the hexaphenol motif. Their inhibiting activity of Dyrk1a was tested in vitro and one already showed a better activity than natural EGCG
Gagnon, David. "Méthodologie impliquant une réaction de Mitsunobu et un réarrangement signatropique [3,3] en tandem afin de préparer des hétérocycles énantio-enrichis. Application à la synthèse totale de la (+)-aspidofractinine." Thèse, Université de Sherbrooke, 2008. http://savoirs.usherbrooke.ca/handle/11143/5101.
Full textCaignard, Pascal. "Synthèse d'analogues tricycliques du procoralan." Paris 6, 2007. http://www.theses.fr/2007PA066721.
Full textZorn, Nicolas. "Etude d'une synthèse totale enantioselective, de l'enfumafongine." Paris 6, 2004. http://www.theses.fr/2004PA066344.
Full textBrun, Virginie. "Inhibiteurs de kinases dépendantes des cyclines : développement d'une nouvelle stratégie de synthèse de purines 2, 6, 9-trisubstituées sur support solide." Paris 11, 2002. http://www.theses.fr/2002PA112044.
Full textIn order to find more potent and specific inhibitors of CDKs, we have developed a new solid phase synthesis strategy for the construction of 2,6,9-trisubstituted purine libraries. The objective of the approach is to permit the sequential introduction of functionality onto all three crucial positions of the purine ring. Our strategy is based upon the reactivity of a 6-thio substituted purine scaffold connected to the resin support via the sulfur atom. The low reactivity of the purine C6-S bond relative to C6-Cl provides the possibility to introduce a wide variety of functionality at the N9 and C2 position prior to reaction at C6. Subsequent activation of the sulfur atom (oxidation) then opens the way to concomitant introduction of a substituent (nucleophile) at C6 and cleavage of the trisubstituted purine product from the resin. It was necessary to first validate the synthetic plan in solution. The condensation of the 2-iodo-6-chloropurine with benzylthiol was achieved in high yield (this key transformation served to mimic the attachment of the purine scaffold to a resin support). .
Peyrat, Sandrine. "Vers la synthèse de C-glycosyl aminoxy peptides et d'oligomères de nucléosides aminoxy acides." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2011. http://tel.archives-ouvertes.fr/tel-00675657.
Full textGarzon, Cecile. "Développement de réactions organocatalysées et de métathèse cyclisante pour la synthèse de vinylphosphonates hétérocycliques et carbocycliques à potentialités biologiques." Thesis, Aix-Marseille 3, 2011. http://www.theses.fr/2011AIX30034.
Full textFunctionalized vinylphosphonates constitute an important class of building blocks used in organic synthesis and aroused great interest due to their various biological activities. Thus, we developed several synthetic methodologies to reach these compounds. The most general method entails an organocatalyzed substitution reaction using an original substrate, and allows the synthesis of numerous hitherto unknown vinylphosphonates.Then, the synthesis of azaheterocyclic vinylphosphonates was investigated using the ring closing metathesis from appropriate substrates which are obtained through the above methodology.Finally, we have set up the first enantioselective synthesis of UPF 702 (a cyclic vinylphosphonate including the amino acid moiety), known to exhibit agonist activity towards glutamate receptors, and thus potentially active against central nervous system diseases. Two synthetic approaches were devised, based on the organocatalyzed substitution followed by ring closing metathesis. The enantioselectivity was brought by enzymatic resolution or desymmetrisation, whereas the amino acid was prepared via a Curtius rearrangement
Lawrence, James. "MODIFICATIONS DE LA LIAISON PEPTIDIQUE : N-HYDROXY-, N-ACYLOXY- ET N-ALKYLOXY-PEPTIDES." Phd thesis, Université Joseph Fourier (Grenoble), 2006. http://tel.archives-ouvertes.fr/tel-00114491.
Full textMann, Stéphane. "Synthèse et mécanisme d'action de l'amiclénomycine, un inhibiteur de la DAPA aminotransférase." Paris 6, 2002. http://www.theses.fr/2002PA066242.
Full textFrigell, Jens. "Synthesis of O-linked Carbasugar Analogues of Galactofuranosides and N-linked Neodisaccharides." Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-43561.
Full textAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript. Paper 5: Manuscript. Paper 6: Manuscript.
Goran, Benedeković. "Enantiodivergentna totalna sinteza odabranih stiril laktona i preliminarno ispitivanje njihove citotoksičnosti." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2012. http://dx.doi.org/10.2298/NS20121011BENEDEKOVIC.
Full textEnantiodivergent total syntheses of both (+)- and (−)-enantiomers of goniofufurone, 7-epi-goniofufurone and crassalactone C have been accomplished starting from D-glucose. The key steps of the synthe-sis of 7-epi-(+)-goniofufurone were a stereo-selective addition of phenyl magnesium bromide to a protected dialdose, followed by a stereospecific furano-lactone ring formation by condensation of a partially protected lactole with Meldrum’s acid. The synthesis of (+)-goniofufurone and (+)-crassalactone C required a configurational inversion at C-5 in the common intermediate that was efficiently achieved under the standard Mitsunobu conditions, or alternatively through a sequential oxidation of the benzylic hydroxyl group followed by a stereo-selective reduction with borohydride. A similar approach was applied to the synthesis of the unnatural enantiomers of goniofufurone, 7-epi-goniofufurone and crassalactone C, two novel, conformationally constrained analogues of both (+)- and (−)-goniofufurone (oxetanes 34 and ent-34). as well as the corresponding 7-deoxygenated derivatives (31 and ent-31). We have also developed the first total synthesis of (+)-crassalactone B (2) and an alternative synthesis of (+)-crassalactone C (3) starting from D-glucose. Finally, the synthesized styryl-lactones were evaluated for their antiproliferative activity against a panel of human tumor cell lines.
Kefalas, Panagiotis. "Synthèse d'une indolizidine hydroxylée, analogue de la castanospermine." Paris 11, 1988. http://www.theses.fr/1988PA112340.
Full textSeveral attempts for the synthesis of the indolizidinic alkaloid (1S,6S,7R,8R,8aR)-1,6,7,8 tetrahydroxy-octahydroindolizine (castanospermine), a glucosidase inhibitor and of its epimers are described. The general synthetic approach was undertaken starting from sugars that have an established configuration on the carbon atoms corresponding to the C-6, C-7 and C-8 centres of the indolizidinic ring. Ln a first synthetic route we have studied the formation of the alkaloid five-member ring, through the application of α-aminonitrile chemistry on the aldehyde 1,2-O-isopropylidene-α-D-xylo-pentodialdo-1,4-furanose prepared from D-(+)-Glucose; either by formation of the N-benzyl,α-aminonitrile, followed by the introduction of C-2 and C-3 and cyclization, or by the synthesis of the α-aminonitrile carrying C-2 and C-3 substituted on the amine function and ring closure. The difficulties met during this route obliged us to abandon. In a second approach we have studied the formation of the polyhydroxylated indolizidinic ring starting from D-Glucose, D-Xylose and D-Arabinose derivatives; we introduce C-1, C-2 and C-3 and the oxygen on C-1 in the form of an enol ether, by Wittig reaction. Then we form a 1,2-oxazine-3,6- dihydro-2H; 4 ethoxy by Diels-Alder reaction with a dienophile carrying the nitroso function. The glucose derivative does not meet the requirements for the continuation of the synthesis, due to the sensitivity of the furan ring in the basic medium of the Wittig reaction. Cyclization of the oxazine on the tosylated sugar frame supplies a bicyclic product. Reduction of the double bond and the N-O bond of the arabinose series derivative give a δ-aminoalcohol which leads to the (1S,6S,7R,8R,8aS),1-ethoxy,6-hydroxy;7,8-O- isopropylidene octahydroindolizine(ie. A close analog of castanospermine) by dehydrative cyclization. (Mitsunobu reaction). The same reaction sequence could not be used on the bicyclic xylose derivative; the Mitsunobu reaction being inappropriate for steric reasons
Satpathi, Hirak. "Novel phosphorus containing poly(arylene ethers) as flame retardant additives and as reactant in organic synthesis." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-176136.
Full textDautrey, Sébastien. "Synthèse et étude conformationnelle de nouveaux oligomères mixtes : les [[alpha]/[alpha]-N-amino]mères." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL053N/document.
Full textThis work describes the synthesis and the conformational study of new mixed oligomers. In the first chapter, using previous work on the synthesis of N-aminodipeptids, we were obtained mixed oligomers alternating amid and N-aminoamid bond named [[alpha]/[alpha]-N-amino]mers. The oligomerization of N-aminopeptids in liquid phase was achieved through an acid fluorid coupling from a building block with the protections Boc (N-terminus), Bn (C-terminus) and phtaloyl (N-side). The second chapter presents the results obtained by different conformational spectroscopic methods (NMR, IR and DC) and molecular modeling on the various oligomers synthesized in Chapter 1. This work has allowed to highlight a original repetitive folding by a C8 hydrogen bond involving the carbonyl group of phthalimid and a amid proton
Lepitre, Thomas. "Modulation des Processus Domino au départ des Accepteurs de Michael en série Chromone : Diversité par aza-Cyclisation, Arylation et Aryloxylation Métallocatalysées : Diversité par aza-Cyclisation, Arylation et Aryloxylation Métallocatalysées." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMLH31/document.
Full textIn the early 2000s a general consensus has emerged in which the molecular diversity within a given library of small molecules, rather than its size, has been recognized as a crucial requirement. Diversity-oriented synthesis (DOS) has emerged from this new paradigm. This novel approach aims to generate collections of small molecules with high degrees of structural diversity, in the most efficient way, starting from simple building-blocks. Since the generation of collections of structurally diverse small molecules in a DOS-driven approach constitutes a real challenge, diverse strategies have been set up for this purpose.In this line, this work has shed light on the great potential of a domino process as a valuable tool in a DOS-driven strategy, capable of generating both molecular diversity and architectural complexity. This study has been focused on the 3-formylchromone building block, a particular framework which has already proven being an exceptionally versatile precursor of molecular diversity. In this manuscript, we will highlight how it is possible to modulate the course of a domino process to achieve high degrees of molecular diversity, starting from the chromone based 1,6-Michael acceptors platform and primary amines as reaction partners. In particular we will show how it is feasible to control the course of particular steps involved in the domino process through: (I) the pertinent modulation of the Michael acceptors and the primary amines structures, (II) the modulation of the reaction parameters (solvent, temperature, additives), and (III) the tuning of the reactivity within a key reaction intermediate induced by the introduction of an external agent
Liu, Shi-hao, and 劉士豪. "Stereoselective Glycosylation of exo-galactal by Suzuki-Miyaura reaction and Mitsunobu reaction." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/79414950977383047856.
Full text中國醫藥大學
藥物化學研究所碩士班
99
Herein we report C-arylglycosylation and O-glycosylation of exo-glycals, in which two products are generated in association with Suzuki-Miyaura reaction and Mitsunobu reaction C-arylglycosides were synthesized in moderate to good yields by reaction of exo-glycals and arylboronic acids in the presence of 0.5 equiv. Pd(OAc)2. The C-arylglycosylation reaction of a aryl-Pd complex to exo-glycals double bond followed by syn elimination of HPd(OAc) to provide a carbon-Ferrier type product. Mitsunobu reagent mediated O-glycosylation of exo-glycals have been carried out in moderate yields, in which a mixture of two products are often obtained resulting from Ferrier rearrangement and substraction. The exo-glycals reacte with various phenol derivates to afford glycoside with highly α- Stereosrlective.
Dauphinais, Maxime. "Expansion de la réaction de Mitsunobu par l’introduction d’un nouveau réactif polyvalent." Thèse, 2017. http://hdl.handle.net/1866/20969.
Full textJanes, Marc K. "Synthèse de la triphénylphosphine liée au polystyrène non réticulé et son utilisation lors de la réaction de Mitsunobu. Cyclopropanation catalytique énantiosélective d'alcènes utilisant le diazométhane." Thèse, 2005. http://hdl.handle.net/1866/6569.
Full textLin, Yu-Li, and 林于莉. "(1)Synthesis of Substituted 5,14-dihydro-8H-13-oxadibenzo[a,f]cyclodecene via Ring-Closing Metathesis(2)Conversion of alcohols into alkyl halides via Mitsunobu reaction." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/94191663620512138344.
Full text高雄醫學大學
醫藥暨應用化學系碩士班
92
Part Ⅰ As part of an ongoing study of the chemistry of benzoheterocyclic compounds, a series of 10-membered macrocyclic ethers annulated with substituted benzene is described. O-allylbenzylalcohols and O-allyl- phenols, derived from isovanillin, were coupled by the Mitsunobu reaction to construct the intramolecular dienes as precursor for ring- closing metathesis (RCM). Finally, by the treatment of Grubbs’ catalyst the intramolecular dienes were cyclized to give the desired compounds, 10-membered macrocyclic ethers, respectively. Part Ⅱ Two new methods for the conversion of alcohols into alkyl chloride are established. Method 1, alcohols were reacted with DIAD, TPP and 2-thiothiazoline to undergo Mitsunobu reaction to produce 2-alkylthio- thiazolines which were subsequently treated with ethyl chloroformate to produce alkyl chlorides in good yields. Mothod 2, alcohols were reacted with triphenylphosphine (TPP), diisopropyl azodicarboxylate (DIAD) in THF, followed by treating with ethyl chloroformate to afford alkyl chlorides in one pot in moderate yields.
Sousa, Gabriel Guedes de. "New Methods for the Synthesis of Novel Phenylpropanoid Glucose Esters." Master's thesis, 2019. http://hdl.handle.net/10362/89154.
Full textSchulz, Bechara William. "Activation chimiosélective et dérivatisation d’amides et d'alcools : synthèse de plusieurs groupements fonctionnels et hétérocycles." Thèse, 2014. http://hdl.handle.net/1866/12320.
Full textPeixoto, Catarina Soares. "New methodology for the synthesis of β-substituted-alcohols." Master's thesis, 2013. http://hdl.handle.net/10451/29634.
Full textβ-fluoro alcohols are an important class of natural and synthetic molecules with biological activity as, for example, antibacterial and antiviral drugs, and caspase inhibitors, and are used as precursors for the preparation of other drugs. Diols and polyols have demonstrated over the years to be useful building blocks, but their use is often subdued by the assistance of protecting groups. Protecting groups are fundamental in organic synthesis, being common their use in synthesis involving polyfunctional molecules such as polyols. Professor Azzena group developed a protecting group category for protection of alcohols based on biphenyl and terphenyl ethers that can be cleaved by reduction with alkali metals. A couple of synthetic plans were designed concerning the selective introduction of this protecting group in a diol, which can be introduced by Mitsunobu, Williamson or aromatic nucleophilic substitution, with retention or inversion of configuration. The selectively protected diol can be a useful intermediate in further synthetic steps that could involve, although not necessarily, secondary hydroxyl activation by formation of a tosylate and subsequent nucleophilic substitution or other modification on the diol since the ether is a very stable protective group. The last step of the design is related with selective deprotection of the protecting group without damage of the modifications operated on the secondary hydroxyl group.
Os β-fluoro álcoois são uma importante classe de moléculas naturais e sintéticas com actividade biológica como, por exemplo, actividade antibacteriana e antiviral, actividade inibitória das caspases, e são usados como precursores para a preparação de outros fármacos. Os dióis e polióis têm demonstrado ao longo dos anos serem úteis blocos de construção, mas o seu uso necessita frequentemente da assistência de grupos de protecção. Os grupos de protecção são fundamentais na síntese orgânica, sendo comum o seu uso na síntese envolvendo moléculas polifuncionais como os polióis. O grupo do Professor Azzena desenvolveu uma categoria de grupos protectores para a protecção de alcoóis, bifenil e terfenil éteres que podem ser clivados por redução com alquilometais. Alguns planos sintéticos foram elaborados baseados na introdução selectiva deste grupo de protecção num diol, o qual pode ser introduzido por Mitsunobu, Williamson ou substituição nucleofílica aromática, com retenção ou inversão da configuração. O diol protegido selectivamente pode ser um útil intermediário para passos sintéticos seguintes que podem envolver, embora não necessariamente, a activação do grupo hidroxilo secundário com formação do tosilato e consequente substituição nucleofílica ou outra modificação no diol uma vez que o éter é um grupo de protecção muito estável. O último passo dos métodos propostos está relacionado com a desprotecção selectiva do grupo de protecção sem danificar as modificações operadas (ou realizadas) no grupo hidroxilo secundário.
Department of Chemistry and Pharmacy, Università di Sassari
Geranurimi, Azade. "Lactam-peptide modulators of biased interlukin-1 receptor signaling for mitigating inflammation without compromising immuno-vigilance." Thesis, 2019. http://hdl.handle.net/1866/23926.
Full textPreterm birth (PTB) is an unmet biomedical need. Despite efforts to counter the onset of preterm labor, the rate of premature birth has increased steadily in developed countries. The interleukin-1 receptor (IL-1R) has been pursued as a target for designing agents which can prolong labor and improve neonatal outcomes. Towards these goals, a lead peptide 101.10 had been shown to modulate the IL-1R, to delay PTB and to mitigate associated retinopathy of prematurity (ROP) by an allosteric mechanism featuring biased signaling. With the goals of understanding the active conformers and improving the activity of 101.10, methods were conceived for the synthesis and introduction of β-substituted α-amino γ-lactams into peptides. Applying such methods on 101.10 has provided insight into the structure-activity relationships required for allosteric modulation of the IL-1R. Peptidomimetics are promising structures that replicate peptide function and conformation. They offer the potential to improve molecular-recognition, to enhance transport across biological membranes, and to resist metabolism. Among peptidomimetic classes, α-amino γ-lactam (Agl) residues introduce covalent constraint to rigidify the peptide backbone and have been employed to favor turn secondary structures. β-Substituted Agl analogs offer additional potential to mimic and restrict peptide side-chain geometry. This thesis introduces effective methods for the stereo-controlled synthesis of β-substituted α-amino γ-lactams residues having various side chain functionality. Introduction of the parent Agl residue and β-substituted counterparts into biologically active peptides has been explored to study structure-activity relationships. Employing the IL-1R modulator 101.10 as a representative peptide, the described research has furnished novel labor delaying agents that can improve neonatal outcomes. In chapter 2, α-amino-γ-lactam (Agl) and β-hydroxy-α-amino-γ-lactam (Hgl) stereoisomers were employed to study the influence of configuration and hydroxyl group side chain on conformation and activity of the interleukin-1 receptor modulator peptide 101.10. The configuration and hydroxyl group side chain influenced the conformation and biological activity of Agl and Hgl-101.10 analogs. Circular dichroism (CD) spectroscopy illustrated β-turn conformers for specific analogs, such as [(3R,4S)-Hgl3]-101.10. The Agl and Hgl analogs were examined in a series of in vitro assays and in vivo models of PTB. Contingent on their structure vi and configuration, the lactam analogs exhibited different functional selectivity in the various biological pathways, and indicated the requirement for specific phenotypes. For example, inhibition of the JNK and ROCK kinase pathways were respectively shown to be important for delaying labor and diminishing vaso-obliteration in the PTB and ROP models. Notably, among the twelve analogs, [(3R,4S)-Hgl3]-101.10 was found to exhibit identical in vitro and in vivo activity as the parent peptide. In chapter 3, methods were developed for displacement of the β-hydroxy-α-amino-γ-lactam (Hgl) residue alcohol to introduce stereo-selectively different β-substituents on Agl residues. A combination of Mitsunobu chemistry on the trans Hgl residue, and nucleophilic ring opening of the cyclic sulfamidate derived from the cis lactam counterpart provided constrained mimics of Ser, Thr, Cys, Dap, Dab, His and Met residues. In chapter 4, various β-substituted lactams were introduced into the sequence of 101.10 by combination of solution and solid phases chemistry to further study the structural requirements for regulating the activity and signaling of this key cytokine mediator of inflammasome activation. Considering the activity of [(3R,4S)-Hgl3]-101.10, the β-substituted Agl analogs were synthesized possessing similar backbone and side chain configurations. Certain analogs exhibited promising biological activity in the ROP model meriting further study. In sum, methods were conceived for the synthesis and application of α-amino-γ-lactams and their β-substituted analogs to study peptide structure-activity relationships. Employing this chemistry on the IL-1R allosteric modulator 101.10 has identified the active conformer and in vitro activity responsible for ability to delay labor and mitigate retinopathy of prematurity. Considering the utility of the lactam synthesis methods for the development of improved agents for delaying labor and improving neonatal outcomes, this thesis has conceived useful prototypes for drugs to treat PTB, as well as useful methods for dissecting the structural requirements for peptide chemical biology.