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Letteratura scientifica selezionata sul tema "Asymmetric synthesis"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 30 novembre 2024

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Articoli di riviste sul tema "Asymmetric synthesis"

1

Chen, Fen-Er, e Lei Chen. "Total Synthesis of Camptothecins: An Update". Synlett 28, n. 10 (15 marzo 2017): 1134–50. http://dx.doi.org/10.1055/s-0036-1588738.

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Over the last few decades, considerable research efforts have been directed toward the development of effective chemical syntheses of camptothecin and its analogs. The last comprehensive review of this area was published in 2003 and many effective new methods have since been reported for the stereoselective synthesis of the camptothecin alkaloids. In this account, we have summarized most of the novel synthetic approaches developed for the synthesis of camptothecins during the last decade. We have focused on strategies for the construction of the pentacyclic ring system and the different methods used to install the chiral quaternary center on the E ring of camptothecin.1 Introduction2 Synthesis of Racemic Camptothecins3 Enantioselective Synthesis of Camptothecins3.1 Sharpless Asymmetric Dihydroxylation3.2 Catalytic Asymmetric Cyanosilylation3.3 Auxiliary-Induced Asymmetric Carbonyl Addition3.4 Catalytic Asymmetric Ethylation3.5 Asymmetric Hydroxylation4 Conclusion

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2

Arseniyadis, S., P. Q. Huang, D. Piveteau e H. P. Husson. "Asymmetric synthesis". Tetrahedron 44, n. 9 (gennaio 1988): 2457–70. http://dx.doi.org/10.1016/s0040-4020(01)81697-5.

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3

Jurczak, Janusz, e Tomasz Bauer. "Glyoxylic acid derivatives in asymmetric synthesis". Pure and Applied Chemistry 72, n. 9 (1 gennaio 2000): 1589–96. http://dx.doi.org/10.1351/pac200072091589.

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Synthesis of chiral derivatives of glyoxylic acid with special emphasis on N-glyoxyloyl-(2R)-bornane-10,2-sultam is presented. Investigation of glyoxylic acid chiral derivatives in various stereocontrolled organic syntheses showed their excellent ability to provide products of high optical purity. Application of our methodology to the synthesis of natural products and their analogs is presented.

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4

Deng, Yongming, Qing-Qing Cheng e Michael Doyle. "Asymmetric [3+3] Cycloaddition for Heterocycle Synthesis". Synlett 28, n. 14 (5 luglio 2017): 1695–706. http://dx.doi.org/10.1055/s-0036-1588453.

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Asymmetric syntheses of six-membered ring heterocycles are important research targets not only in synthetic organic chemistry but also in pharmaceuticals. The [3+3]-cycloaddition methodology is a complementary strategy to [4+2] cycloaddition for the synthesis of heterocyclic compounds. Recent progress in [3+3]-cycloaddition processes provide powerful asymmetric methodologies for the construction of six-membered ring heterocycles with one to three heteroatoms in the ring. In this account, synthetic efforts during the past five years toward the synthesis of enantioenriched six-membered ring heterocycles through asymmetric [3+3] cycloaddition are reported. Asymmetric organocatalysis uses chiral amines, thioureas, phosphoric acids, or NHC catalysis to achieve high enantiocontrol. Transition-metal catalysts used as chiral Lewis acids to activate a dipolar species is an alternative approach. The most recent advance, chiral transition-metal-catalyzed reactions of enoldiazo compounds, has contributed toward the versatile and highly selective synthesis of six-membered heterocyclic compounds.1 Introduction2 Asymmetric Formal [3+3]-Cycloaddition Reactions by Organocatalysis2.1 By Amino-Catalysis2.2 By N-Heterocyclic Carbenes2.3 By Bifunctional Tertiary Amine-thioureas2.4 By Chiral Phosphoric Acids3 Asymmetric Formal [3+3]-Cycloaddition Reactions by Transition-Metal Catalysis3.1 Copper Catalysis3.2 Other Transition-Metal Catalysis4 Asymmetric [3+3]-Cycloaddition Reactions of Enoldiazo Compounds4.1 Asymmetric [3+3]-Cycloaddition Reactions of Nitrones with Electrophilic Metallo-enolcarbene Intermediates4.2 Dearomatization in Asymmetric [3+3]-Cycloaddition Reactions of Enoldiazoacetates4.3 Asymmetric Stepwise [3+3]-Cycloaddition Reaction of Enoldiazoacetates with Hydrazones5 Summary and Outlook

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5

Devi, Runjun, e Sajal Kumar Das. "Studies directed toward the exploitation of vicinal diols in the synthesis of (+)-nebivolol intermediates". Beilstein Journal of Organic Chemistry 13 (21 marzo 2017): 571–78. http://dx.doi.org/10.3762/bjoc.13.56.

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While the exploitation of the Sharpless asymmetric dihydroxylation as the source of chirality in the synthesis of acyclic molecules and saturated heterocycles has been tremendous, its synthetic utility toward chiral benzo-annulated heterocycles is relatively limited. Thus, in the search for wider applications of Sharpless asymmetric dihydroxylation-derived diols for the synthesis of benzo-annulated heterocycles, we report herein our studies in the asymmetric synthesis of (R)-1-((R)-6-fluorochroman-2-yl)ethane-1,2-diol, (R)-1-((S)-6-fluorochroman-2-yl)ethane-1,2-diol and (S)-6-fluoro-2-((R)-oxiran-2-yl)chroman, which have been used as late-stage intermediates for the asymmetric synthesis of the antihypertensive drug (S,R,R,R)-nebivolol. Noteworthy is that a large number of racemic and asymmetric syntheses of nebivolol and their intermediates have been described in the literature, however, the Sharpless asymmetric dihydroxylation has never been employed as the sole source of chirality for this purpose.

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6

Khangarot, Rama Kanwar, Manisha Khandelwal e Sumit Kumar Ray. "Syntheses and Applications of Singh’s Catalyst". Synthesis 52, n. 23 (19 agosto 2020): 3577–82. http://dx.doi.org/10.1055/s-0040-1707235.

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Singh’s catalyst has emerged as one of the most promising and valuable catalysts in the field of asymmetric synthesis. Since its discovery, it has proven to be one of the best organocatalysts for asymmetric direct aldol reactions, and is equally efficient in aqueous and organic media. In this Short Review, we summarize reactions utilizing Singh’s catalyst under various conditions.1 Introduction2 Synthesis of Singh’s Catalyst3 Applications in Asymmetric Synthesis4 Conclusion

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7

PFANDER, H. "ChemInform Abstract: Carotenoid Synthesis. Asymmetric Syntheses". ChemInform 28, n. 6 (4 agosto 2010): no. http://dx.doi.org/10.1002/chin.199706303.

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8

Huang, Deng-Ming, Hui-Jing Li, Jun-Hu Wang e Yan-Chao Wu. "Asymmetric total synthesis of talienbisflavan A". Organic & Biomolecular Chemistry 16, n. 4 (2018): 585–92. http://dx.doi.org/10.1039/c7ob02837g.

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The first asymmetric total syntheses of talienbisflavan A and bis-8,8′-epicatechinylmethane as well as a facile synthesis of bis-8,8′-catechinylmethane has been accomplished from readily available starting materials by using a newly developed direct regioselective methylenation of catechin derivatives as one of the key steps.

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9

Dhayalan, Vasudevan, Rambabu Dandela, K. Bavya Devi e Ragupathy Dhanusuraman. "Synthesis and Applications of Asymmetric Catalysis Using Chiral Ligands Containing Quinoline Motifs". SynOpen 06, n. 01 (18 gennaio 2022): 31–57. http://dx.doi.org/10.1055/a-1743-4534.

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AbstractIn the past decade, asymmetric synthesis of chiral ligands containing quinoline motifs, a family of natural products displaying a broad range of structural diversity and their metal complexes, have become the most significant methodology for the generation of enantiomerically pure compounds of biological and pharmaceutical interest. This review provides comprehensive insight on the plethora of nitrogen-based chiral ligands containing quinoline motifs and organocatalysts used in asymmetric synthesis. However, it is confined to the synthesis of quinoline-based chiral ligands and metal complexes, and their applications in asymmetric synthesis as homogeneous and heterogeneous catalysts.1 Introduction2 Synthesis of Chiral Ligands Containing Quinoline Motifs2.1 Synthesis of Schiff Base Type Chiral Ligands2.2 Synthesis of Oxazolinyl-Type Chiral Ligands2.3 Synthesis of Chiral N,N-Type Ligands2.4 Synthesis of Amine-Based Chiral Ligands2.5 Synthesis of P,N-Type Chiral Ligands2.6 Synthesis of Chiral N-Oxide and Nitrogen Ligands3 Homogeneous Catalytic Asymmetric Reactions3.1 Asymmetric Carbon–Carbon Bond Formation Reactions3.2 Asymmetric Allylic Reactions3.3 Asymmetric Cycloadditions3.4 Asymmetric Carbene Insertions3.5 Asymmetric Pinacol Couplings3.6 Asymmetric Pudovik Reactions3.7 Asymmetric Strecker Reactions4 Heterogeneous Catalytic Asymmetric Reactions4.1 Asymmetric Cyclopropanation of Olefins4.2 Asymmetric Heck Reactions4.3 Asymmetric Hydrogenations4.4 Asymmetric Hydroformylation of Styrene4.5 Asymmetric Dialkoxylation of 2-Propenylphenols4.6 Asymmetric Cascade Cyclizations4.7 Asymmetric Allylic Alkylations4.8 Asymmetric Alkylation of β-Keto Esters4.9 Asymmetric C–H Bond Arylation Reactions4.10 Intramolecular Aerobic Oxidative Amination of Alkenes4.11 Asymmetric Oxidative Hydroboration of Alkenes5 Conclusions

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10

NOYORI, Ryoji. "Catalytic Asymmetric Synthesis." Journal of Synthetic Organic Chemistry, Japan 50, n. 12 (1992): 1131–39. http://dx.doi.org/10.5059/yukigoseikyokaishi.50.1131.

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Tesi sul tema "Asymmetric synthesis"

1

Case-Green, S. C. "Double asymmetric synthesis". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293361.

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2

Ridge, Katerina. "Absolute asymmetric synthesis". Thesis, University of Surrey, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493053.

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One possible way of achieving absolute asymmetric synthesis is by "freezing" the chirality of a molecule by crystaUisation. This work is a study of the synthesis of :ertain imides which have potential for axial chirality and are likely to undergo spontaneous resolution on crystallisation. The synthesis starts from achiral compounds and therefore, if it does yield chiral crystals by spontaneous resolution, it can be classified as absolute asymmetric synthesis.

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3

Lewis, Neil. "Asymmetric piperidine synthesis". Thesis, University of Nottingham, 1995. http://eprints.nottingham.ac.uk/13293/.

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It has been demonstrated that bakers' yeast reduction of 1-tert-butyl-2-methyl 3-oxo-piperidine-1,2-dicarboxylate gives (2R, 3S), 1-tert-butyl-2-methyl 3-hydroxy-piperidine-1,2-dicarboxylate in 80% chemical yield with >99% d.e. and >97% e.e. Also bakers' yeast reduction of 1-tert-butyl-3-ethyl 4-oxo-piperidine-1,3-dicarboxylate gives (3R, 4S), 1-tert-butyl-3-ethyl4-hydroxy-piperidine-1,3-dicarboxylate in 74% chemical yield with >99% d.e. and >93% e.e. The optical purity and absolute configurations of the hydroxy-ester derivatives were determined by conversion into the corresponding chiral bis-tosylate derivatives of 2- and 3-piperidinemethanol respectively. It has also been shown that bakers' yeast reduction of 1-tert-butyl-4-methyl 3-oxo-piperidine-1,4-dicarboxylate gives (3R, 4R)-1-tert-butyl-4-methyl 3-hydroxypiperidine-dicarboxylate in 81% chemical yield with >99% d.e. and 87% e.e. The optical purity and absolute configuration of the hydroxy-ester derivative were determined by utilisation of the compound in the total synthesis of (R)-3-quinuclidinol via chain elongation at C-4 of the piperidine followed by cyclisation to produce the bicyclic structure. Further work is reported on the diastereoselective synthesis of polyhydroxylated indolizidine alkaloids. 1-Acetoxy-2-hydroxy-3-(hydroxymethyl)-indolizidine has been synthesised as a single diastereomer from 2-piperidinemethanol via attack of an amine onto an epoxide functionality thus producing the bicyclic system.

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4

Pedersen, Daniel Sejer. "Asymmetric cyclopropane synthesis". Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613762.

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5

Harris, Matthew Eben. "Asymmetric lactam synthesis". Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/58635/.

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Broad-Spectrum Chemokine Inhibitors (BSCIs) are a novel type of antiinflammatory drug, discovered by Fox and colleagues. We have shown that the syntheses of C-substituted γ-thialactams are possible via a modular approach starting from the simple amino acid cystine. These compounds are a new class of GPCR ligand, showing BSCI activity comparable to their non-sulfur counterparts. Initial migratory data suggests that these lactams are inhibitors of leukocyte migration and comparable to the analogous BSCI lactams at μM concentrations, with decreased activity at the nM scale. Efforts have been made to the synthesis of substituted piperidinones, as well as employing Jocic-Reeve-Corey-Link chemistry to the general synthesis of lactams, ultimately looking to the synthesis of C-substituted lactams. Attempting to utilise trichloromethyl carbinol chemistry for these purposes has led to the synthesis of stereochemically-pure heterocycles containing up to 3 stereocentres. α- Trichloromethyl carbinols and asymmetric transfer hydrogenation chemistry are used from simple starting materials. Developments of this type of chemistry will undoubtedly lay the foundations to produce further non-racemic substituted heterocycles which will be important both synthetically and biologically.

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6

Ravindran, Swarnam Shanthi. "Studies in asymmetric synthesis". Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1005017.

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The stereoselectivity of TiCI₄-catalysed Mukaiyama reactions of a camphor acetal-derived chiral silyl enol ether with a range of substituted aromatic aldehydes has been examined. The enantiomeric excess in each of the resulting ß-hydroxy ketones, determined by ¹H NMR spectroscopy using the lanthanide chiral shift reagent Pr(Etcf₃), ranged between 9 and 13%. The stereo-directing potential of the camphor acetal as a chiral auxiliary in the α-benzylation of carboxylate esters has been studied; the acids were chosen to illustrate substituent effects on asymmetric induction. The observed diastereoselectivity increased with increasing steric bulk of the ester group and α-benzylation of the tert-butylacetate derivative proceeded with 48% diastereoselectivity. It is proposed that the enolate adopts an endo-s-trans conformation in the transition state and preferential attack by the electrophile at the somewhat less hindered Si-face is supported by both the optical rotation data and computer modelling studies. Reductive cleavage and hydrolysis of one of the benzylated esters furnished known products from whose optical rotation the configuration of the major diastereomer was established. In order to improve the steric advantage of Si-facial attack, methods of increasing the steric bulk of the blocking group were explored. A novel 2,2-propylenedioxy hydroxycamphor acetal and its 3,3-propylenedioxy analogue were prepared. Selected carboxylate esters of these propylenedioxy acetals were subjected to α-benzylation and the 2,2-(propylenedioxy)-3-exo-tert-butylacetate derivative showed a diastereoselectivity of 57% during a-benzylation. Hydrolysis of the abenzylated phenylacetate analogue offered the known 2,3-diphenylpropanoic acid whose optical rotation indicated the preferred configuration at the new chiral centre to be (R), a result which is consistent with the proposed approach of the electrophile to the less hindered Re-face of theendo-s-trans enolate moiety and reflects an inversion of the configurational bias observed with 2-v exo-carboxylate analogues. Attempts to prepare the monocatechol acetal of the hydroxy camphor derivative although unsuccessful, led to the isolation of two novel dibornyl ethers whose structures were established by 1- and 2-D NMR spectroscopy. A study of novel applications of camphor-derived auxiliaries in the asymmetric synthesis of α-amino acids has been initiated. The several approaches tried led to the preparation of three novel dural glycine derivatives in good yield

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7

Wang, Ziyu, e 汪子玉. "Organocatalytic asymmetric synthesis of dihydrodibenzofurans and asymmetric aziridination of α-nitroalkenes". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hdl.handle.net/10722/193388.

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The synthesis of useful chiral skeletons from simple achiral starting materials is always the dream of organic chemists. In the past decades, organocatalysis has been rapidly developed and has become one of the most important methods in asymmetric catalysis. The aim of this thesis is to develop asymmetric methods for the construction of useful chiral skeletons based on organocatalytic chemistry. Many natural products and biologically important compounds contain the hydrogenated dibenzofuran (Figure 1) as a common sub-structure. In the first part of this thesis, the first amine-catalysed asymmetric synthesis of a dihydrodibenzofuran species from bisenal substrates has been demonstrated. After a systematic screening of various reaction parameters, the optimal conditions have been found to be as follows: 0.1 M of substrate in solution with toluene with 0.2 equiv of (S)-di(2-naphthyl)pyrrolinol TMS ether (C2.8) and 0.2 equiv of 2-nitrobenzoic acid at 50 ℃ for 7 h under an argon atmosphere (Scheme 1). The first step product, an aldehyde, can be reduced in one pot to an alcohol by NaBH4. This two-step protocol gives exclusive cis selectivity. Many chiral cis-dihydrodibenzofuran species have been synthesized from the corresponding bisenal substrates in moderate to good yield with good to excellent ee (Scheme 1). The resulting cis-dihydrodibenzofuran species have promising synthetic applications. As shown in Scheme 2, the less hindered face of the newly formed C ring is more reactive and highly regioselective functionalizations of the C ring have been achieved. In the second part of this thesis, the first asymmetric aziridination of trans-α-nitroalkenes via a phase-transfer catalysis strategy has been systematically studied. The chiral phase-transfer catalysts screened are derivatives of the cinchona alkaloids. The new cinchonidine-derived phase-transfer catalyst CD17 has been found to be optimal for the aziridination (Figure 2). Addition of a small amount of water is crucial to achieve complete conversion of the reaction. Both trans-1-nitro-2-arylalkenes and trans-1-nitro-2-alkylalkenes are suitable substrates (Scheme 3). The reaction can be run on the gram-scale without significant loss of efficiency and ee. Mechanistic studies have revealed that the aziridination proceeds through an aza-Michael addition followed by an intramolecular SN 2 type three-membered ring formation (Scheme 4).
published_or_final_version
Chemistry
Doctoral
Doctor of Philosophy

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8

White, Rachael A. "Asymmetric Synthesis of Prostaglandins". Digital WPI, 2005. https://digitalcommons.wpi.edu/etd-theses/735.

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Prostaglandins (PGs) are medicinally interesting because of the wide variety of roles they play in the body. PGs are ubiquitous and can be found in the reproductive system, the nervous system, the cardiovascular system, and the immune system. Accordingly, PGs are an important therapeutic target for pharmaceutical companies, and an efficient synthesis is highly desirable. Past research indicates that an approach to prostaglandins via a chiral acetylenic ester or amide provides a promising method for control of C-15 geometry. This project seeks to validate a key stereospecific reduction of an enantiomerically pure cyclopentenone intermediate. This is in turn available from a chiral acetylenic ester or amide via a formal [3+2] cycloaddition step. Several methods have been investigated for asymmetric synthesis of the requisite chiral acetylenic acid derivative including asymmetric conjugate addition, CBS-oxazaborolidine reduction of a ketone, and the separation of diastereomers of a chiral amide. With the optically pure cyclopentenone in hand, we will investigate hydroxyl directed conjugate reduction of the cyclopentenone double bond.

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9

Ambler, P. W. "Asymmetric synthesis of cyclopropanes". Thesis, University of Oxford, 1988. https://ora.ox.ac.uk/objects/uuid:958e77c2-d15e-4d8f-af84-36dca36e4215.

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This thesis is concerned with the asymmetric synthesis of cyclopropyl derivatives via the use of chiral iron acyl complexes of the type (η⁵-C₅H₅)Fe(CO)(PPh₃)(COCH=CR'R), Chapter 1 reviews previous routes to optically active cyclopropyl derivatives and reviews the use of the chiral auxiliary (η⁵-C₅H₅)Fe(CO)(PPh₃) for asymmetric synthesis. Chapter 2 describes the synthesis of the complexes (η⁵-C₅H₅)Fe(CO)(PPh₃)(COCH=CRR') and presents a conformational analysis of the α, β-unsaturated acyl ligand. Chapter 3 describes the diastereoselective synthesis of cis- substituted cyclopropyl complexes via the reaction of Z-α, β-unsaturated iron acyl complexes with electrophilic alkylidene species. Decomplexation, to give the corresponding cyclopropyl esters, occurred without epimerisation of the cyclopropane ring. By the use of homochiral iron acyl complexes the enantioselective synthesis of cyclopropyl derivatives was achieved. Section A describes methylene addition and Section B isopropylidene addition reactions. Section C describes attempts to synthesise pyrethroid insecticide precursors which occurred with good diastereoselectivity but poor regioselectivity. Section D describes electrophilic ethylidene addition reactions in which the chiral auxiliary exerts good stereochemical control over three new chiral centres. Chapter 4 describes the diastereoselective synthesis of trans- substituted cyclopropyl complexes via the reaction of E-α, β-unsaturated iron acyl complexes with nucleophilic alkylidene transfer reagents. Section A describes methylene transfer reagents. Whilst α-lithiosulphides and α-lithiosulphoxides were of limited use, iodomethyllithium (generated in situ) resulted in highly diastereoselective syntheses of the cyclopropyl complexes. Decomplexation, to give the corresponding cyclopropyl esters, occurred without epimerisation of the cyclopropane ring. By the use of homochiral iron acyl complexes the enantioselective synthesis of cyclopropyl derivatives was achieved. Section B describes the generation of 1-iodoethyllithium and 1-iodobutyllithium and their reactions as nucleophilic alkylidene transfer reagents. The stereo- chemistry at two of the new chiral centres is controlled by the iron chiral auxiliary, whilst that at a third is controlled by a number of factors.

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10

Dixon, Darren J. "Asymmetric synthesis of andrimid". Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337813.

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Più fonti

Libri sul tema "Asymmetric synthesis"

1

1958-, Aitken R. Alan, e Kilényi S. N, a cura di. Asymmetric synthesis. London: Blackie Adacemie & Professional, 1992.

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2

Richard, Stephenson G., a cura di. Advanced asymmetric synthesis. London: Chapman & Hall, 1996.

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3

Aitken, R. Alan, e S. Nicholas Kilényi, a cura di. Asymmetric Synthesis. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1346-5.

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1958-, Aitken R. Alan, e Kilényi S. N, a cura di. Asymmetric synthesis. London: Blackie Academic & Professional, 1994.

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5

1958-, Aitken R. Alan, e Kilényi S. N, a cura di. Asymmetric synthesis. London: Blackie Academic & Professional, 1992.

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A, Aitken R., e Kilenyi S. N, a cura di. Asymmetric synthesis. London: Blackie Academic, 1992.

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D, Morrison James, a cura di. Asymmetric synthesis. Orlando: Academic Press, 1985.

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8

Ojima, Iwao. Catalytic asymmetric synthesis. 3^a ed. Hoboken, N.J: John Wiley, 2010.

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Ojima, Iwao, a cura di. Catalytic Asymmetric Synthesis. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470584248.

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Ojima, Iwao, a cura di. Catalytic Asymmetric Synthesis. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2000. http://dx.doi.org/10.1002/0471721506.

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Capitoli di libri sul tema "Asymmetric synthesis"

1

Aitken, R. A. "Chirality". In Asymmetric Synthesis, 1–21. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1346-5_1.

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2

Aitken, R. A. "The description of stereochemistry". In Asymmetric Synthesis, 22–32. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1346-5_2.

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3

Parker, D., e R. J. Taylor. "Analytical methods: determination of enantiomeric purity". In Asymmetric Synthesis, 33–63. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1346-5_3.

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Aitken, R. A., e J. Gopal. "Sources and strategies for the formation of chiral compounds". In Asymmetric Synthesis, 64–82. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1346-5_4.

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Kilenyi, S. N. "First- and second-generation methods: chiral starting materials and auxiliaries". In Asymmetric Synthesis, 83–142. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1346-5_5.

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Kilenyi, S. N., e R. A. Aitken. "Third- and fourth-generation methods: asymmetric reagents and catalysts". In Asymmetric Synthesis, 143–91. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1346-5_6.

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Kilenyi, S. N. "Asymmetric total synthesis". In Asymmetric Synthesis, 192–229. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1346-5_7.

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8

Shintani, Ryo, e Tamio Hayashi. "Asymmetric Synthesis". In Modern Organonickel Chemistry, 240–72. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527604847.ch9.

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9

Chen, Chuan-Feng, e Yun Shen. "Asymmetric Synthesis". In Helicene Chemistry, 137–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53168-6_7.

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Ojima, I. "Asymmetric Synthesis". In Inorganic Reactions and Methods, 247–55. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145319.ch81.

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Atti di convegni sul tema "Asymmetric synthesis"

1

Monteiro, J. L., A. F. Torre, M. P. Paixão e A. G. Corrêa. "Asymmetric synthesis of pyranocumarins under greener conditions". In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_2013101414540.

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2

Carmona, Rafaela C., e Carlos Roque D. Correia. "Asymmetric Arylation of Indenes via Heck-Matsuda Reaction". In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_201381992939.

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3

Ishikawa, Eloisa E., e Luiz F. Silva Jr. "Studies Towards Asymmetric Total Synthesis of Populene D". In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_2013913144428.

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4

Deobald, Anna Maria, Arlene G. Corrêa e Márcio W. Paixão. "Application of New Organocatalysts on Asymmetric Epoxidation of Chalcones". In 14th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-14bmos-r0188-2.

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5

Ribeiro, Joyce Benzaquem, Raquel de Oliveira Lopes, Luciana Dalla Vechia, Aline de Souza Ramos, Selma Gomes Ferreira Leite e Rodrigo Octavio Mendonça Alves de Souza. "Asymmetric reduction of 4-Bromo-Acetophenone using whole cells". In 14th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-14bmos-r0206-1.

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6

Ahmad, Anees, e Luiz F. Silva Jr. "Asymmetric Ring Contraction Reactions Mediated by Chiral I(III)". In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_201398181055.

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7

Feu, Karla S., Sandrina I. R. M. Silva, Marco A. F. M. Junior, Alexander F. de la Torre, Arlene G. Corrêa e Márcio W. Paixão. "PEG: An Efficient Green Solvent for Organocatalytic Asymmetric Michael Addition". In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_2013820194343.

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8

Balike, Krishna Prasad, Subhash Rakheja e Ion Stiharu. "Optimization of Asymmetric Damper Parameters of an Automotive Suspension for Minimal Camber Angle Variations". In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28375.

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Abstract (sommario):

Asymmetric dampers invariably employed in automotive suspensions are known to cause ‘damper jacking’. The influence of the damper jacking on the suspension kinematic responses, particularly variations in the camber angle, are generally ignored while synthesizing a damper. This study presents influences of damper asymmetry on the camber angle variations of a double wishbone type of suspension together with the dynamic responses under measured urban road inputs. Simulation studies employing a kineto-dynamic quarter-car model comprising a bilinear damper revealed increase in the camber angle variations with an increase in the damper asymmetry, while this increment showed nonlinear relation with the suspension deflection. This study further investigates synthesis of an optimal two-stage asymmetric damper to yield a compromise between the conflicting performance measures. A composite performance index comprising the ride comfort and road holding measures with limit constraint on camber angle variation is formulated to seek optimal damper parameters. The results are presented so as to yield design guidance for synthesis of asymmetric dampers.

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Gajaweera, Ruwan N., e Larry F. Lind. "Coupling Matrix Synthesis for Asymmetric Filter Topologies". In 2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components (IMWS). IEEE, 2008. http://dx.doi.org/10.1109/imws.2008.4782266.

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Zhou, Xinhong, Fushi Zhang, Haobo Guo, Fan Sun, Shouzhi Pu e Peng Yuan. "Synthesis and photochromic properties of asymmetric diarylethenes". In Photonics Asia 2002, a cura di Duanyi Xu e Seiya Ogawa. SPIE, 2002. http://dx.doi.org/10.1117/12.483374.

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Rapporti di organizzazioni sul tema "Asymmetric synthesis"

1

Reilly, S. D., D. R. Click, S. K. Grumbine, B. L. Scott e J. G. Watkins. Asymmetric catalysis in organic synthesis. Office of Scientific and Technical Information (OSTI), novembre 1998. http://dx.doi.org/10.2172/677032.

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2

Watkins, B. E., e J. H. Satcher. The synthesis and characterization of new iron coordination complexes utilizing an asymmetric coordinating chelate ligand. Office of Scientific and Technical Information (OSTI), marzo 1995. http://dx.doi.org/10.2172/108153.

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3

Veeck, A. C. 1: Mass asymmetric fission barriers for {sup 98}Mo; 2: Synthesis and characterization of actinide-specific chelating agents. Office of Scientific and Technical Information (OSTI), agosto 1996. http://dx.doi.org/10.2172/414344.

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