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Tesi sul tema "Amino acids"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 agosto 2024

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1

Leung, Wai-yin David. "Synthesis and physical properties of fatty acid derivatives containing amino, amido functions and L-amino acid residues /". [Hong Kong : University of Hong Kong], 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13637666.

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2

Smith, Martin D. "Carbohydrate amino acids". Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302123.

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3

Ardon, Helen. "Anomeric amino acids". Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363889.

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4

Reeve, P. "Functionalising unnatural amino acids". Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/19650/.

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5

Yettella, V. Ramesh Reddy. "Riboflavin Photosensitized Oxidation of Amino Acids". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1217897521.

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6

Barker, Sarah F. "Oxetanes : amino acids & nucleosides". Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275369.

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7

Newill, Philip Louis. "Generating pacidamycin related amino acids". Thesis, University of East Anglia, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533711.

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8

劉理雯 e Lee-man Lau. "Amino acids in soy sauce". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31222894.

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9

Lin, Guoliang. "NOVEL METHANOPYRROLIDINE β– AMINO ACIDS". Diss., Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/92631.

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Abstract (sommario):

Chemistry
Ph.D.
Methanopyrrolidine-5-carboxylic acids (MetPyr-5-acids), or 5-syn-carboxy-2- azabicyclo[2.1.1]hexanes are building blocks for β-peptides that cannot form backbone hydrogen bonds. To introduce functionality to this ring system, 6-syn-benzyloxymethyl and 6-syn-phenyl substituted derivatives have been prepared by an efficient synthetic procedure. Addition of appropriately substituted allyl amines to 3-butynone, amide protection, and irradiation afford mainly 5-acetyl-2-azabicyclo[2.1.1]hexanes. Haloform oxidation leads to the desired 6-substituted MetPyr-5-acids. A 1-ethoxycarbonyl-MetPyr-5-acid also was prepared in high yield. Condensation of ally amine with ethyl 2,4-dioxopentanoate afforded ethyl 2-(allylamino)-4-oxopent-2- enoate, and this was protected to give ethyl 2-[allyl(tert-butoxycarbonyl)amino]-4- oxopent-2-enoate. Irradiation afforded 5-syn-acetyl-1-ethoxycarbonyl-2- azabicyclo[2.1.1]hexane with high stereoselectivity and oxidation of the acetyl group afforded the desired 1-ethoxycarbonyl-MetPyr-5-acid. Resolutions of (±)-6-syn-benzyloxymethyl-MetPyr-5-acid and (±)-1- ethoxycarbonyl-MetPyr-5-acid were carried out (> 98% ee) by a classical resolution method using (S)-(-)-α-methylbenzylamine. The absolute configurations of (1S,4R,5R,6S)-(-)-6-benzyloxymethyl-MetPyr-5-acid and (1R,4S,5S)-(+)- 1- ethoxycarbonyl-MetPyr-5-acid were determined by X-ray analysis of their 5-(S)-(-)-α- methylbenzylamide. A prior X-ray analysis of N-Boc-(MetPyr)4-CO2Me indicated all amides to be trans oriented with all 5-syn-carbonyl groups directed toward Carbon-4 of the methanopyrrolidine. These structures were assigned as T4T4T4T4 or [T4]n (n = 4). The solution structure was not determined. Homooligomers of (1S,4R,5R)-5-syn-carboxy-2- azabicyclo[2.1.1]hexane (MPCA) terminally protected as N-Boc methylesters were constructed by EDC/HOBt coupling of terminal ester N-deprotected free amine units and N-Boc free acid units. To facilitate NMR analysis of the secondary structures of homooligomers, N-Boc was replaced by N-isobutyryl. NMR experiments indicated that N-isobutyryl-(MetPyr)n-CO2Me, (n = 2, 3, 4) have major favored [T4]n-1T where the orientation of the terminal ester carbonyl could not be determined.
Temple University--Theses

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10

Lau, Lee-man. "Amino acids in soy sauce /". Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22401143.

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11

Ke, Hongwei. "Density functional theory studies on glycine conformers and glycine-water complexes /". View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CHEM%202009%20KE.

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12

Yu, Rong. "Metabolic interactions among amino acids, phospholipids and fatty acids". Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45211.

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Cystic fibrosis (CF) is the most common life-shortening disorder among Caucasians. Excessive faecal bile acid loss, increased oxidant stress, reduced plasma choline, increased oxidant stress, reduced glutathione and alterations in essential fatty acids are well recognized in patients with CF. It is also well-known that diabetes perturbs the methionine-homocysteine cycle. However, experimental data linking loss of amino acids in CF or decreased glucose availability in experimental diabetes to altered phospholipids and fatty acid metabolism are lacking. In the liver, bile acids are conjugated with glycine or taurine prior to secretion, and glycine de novo synthesis begins with glucose. Thus, the objectives of this thesis are: 1) to determine if inducing faecal bile acid loss will alter the methionine-homocysteine, and choline-betaine cycle metabolites, phospholipids and phospholipids n-6 and n-3 fatty acids, and 2) to show that experimental diabetes, which decreases glucose availability, alters methionine-homocysteine and choline-betaine cycle metabolites, phospholipids and phospholipid fatty acids in rats. Studies to address the first objective demonstrated that inducing faecal bile acid malabsorption leads to fat malabsorption with increased faecal total lipids and phospholipid excretion. This increased excretion was accompanied by increased plasma betaine concentration, decreased plasma triacylglycerol concentration, increased plasma and liver S-adenosylhomocysteine (SAH) concentration, and changes in the fatty acid composition of hepatic phospholipids. Studies to address the second objective showed that experimental diabetes led to increased plasma betaine concentration, decreased homocysteine concentration, increased liver phosphatidylethanolamine, decreased phosphatidylcholine, changes in the fatty acid composition of hepatic phospholipids, and abundance of the enzyme choline dehydrogenase. Thus, experimental diabetes, which reduces intracellular glucose availability, alters methionine-homocysteine and choline-betaine cycle metabolites, phospholipids and fatty acids. In conclusion, metabolism of phospholipids, their fatty acids, and the amino acids involved in the methionine-homocysteine cycle are inter-related.

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13

梁偉賢 e Wai-yin David Leung. "Synthesis and physical properties of fatty acid derivatives containingamino, amido functions and L-amino acid residues". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31233752.

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14

Wilson, Yvonne Martha. "Directed evolution of D-amino acid oxidase for the oxidation of non-proteinogenic amino acids". Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/11590.

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Random mutagenesis libraries were prepared by propagating the Trigonopsis variabilis D-amino acid oxidase (TvDAAO) gene in a mutator strain and by performing error-prone PCR (epPCR) on the Rhodotorula gracilis D-amino acid oxidase (RgDAAO) gene. These libraries were initially screened using a solid-phase for detection of activity towards β-amino acids. To overcome reproducibility problems, a high-throughput liquid-phase screening method in 96-well plate format was developed, evaluated and used to screen the RgDAAO epPCR library. In the absence of any detectable activity towards the selected β-amino acid substrates, an alternative strategy, which minimised the variant library size and increased the range of substrates, was applied. Single site saturation libraries were generated by saturation mutagenesis PCR at the RgDAAO active site residues F58, M213, Y238 and R285. The resulting variant libraries were screened in the liquid-phase for activity towards a range of proteinogenic and non-proteinogenic amino acids. Saturation mutagenesis at the conserved active site residues Y238 and R285 produced mainly deleterious exchanges. However, saturation at the active site residues F58 and M213 produced a range of beneficial and deleterious variants, allowing substrate profiles to be produced for each. Evaluation of these profiles permitted the identification of individual variants. Although no oxidase activity was detected towards β-amino acids, improved activity was observed in both the F58 and M213 saturation mutagenesis libraries towards several proteinogenic and non-proteinogenic substrates. The improved activity detected in the assay for the variants F58L and H58I towards (rac)-tetrahydroisoquinoline-3-carboxylic acid and for F58M towards (R)-pipecolonic acid was confirmed by performing whole cell biotransformations and analysing the progression of the reactions by HPLC.

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15

Bhatt, Ulhas. "Functionalized 2-oxopiperazines from amino acids". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0014/NQ55303.pdf.

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16

Hutton, Craig Anthony. "Stereoselective functionalization of [alpha]-amino acids /". Title page, contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phh9838.pdf.

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17

Chihora, Remigio M. "The efficacy of protected amino acids". Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333279.

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18

Middleton, Richard John. "Synthesis of unnatural [alpha] - amino acids". Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338866.

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19

Mellor, Lisa Catherine. "Studies on #beta#-substituted amino acids". Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357423.

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20

Warden, Irene. "Synthesis of novel #beta# - amino acids". Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280010.

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21

Ichihara, Osamu. "Asymmetric synthesis of #beta#-amino acids". Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259948.

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22

North, M. "New synthetic routes to amino acids". Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235134.

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23

Fenwick, David R. "Asymmetric synthesis of #beta#-amino acids". Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306983.

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24

Shim, Sung Bo. "Synthesis of some novel amino acids". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293408.

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25

Spivey, Alan Christopher. "The synthesis of #gamma#-amino acids". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293418.

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26

Eishorbagy, Amany. "Sulfur Amino acids and body composition". Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510950.

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27

Bease, Michael Kenneth. "Host structures for α-amino acids". Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/319.

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28

Bailey-Regnaut, Helene. "Host structures for α-amino acids". Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/607.

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29

Thayaparan, Abirami. "Novel carboranes and masked amino acids". Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414167.

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30

Tabanella, Stefania. "Pyridyl-amino acids for potential catalysts". Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269279.

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31

Lukhezo, Muchinyarawo. "Reactive solvent extraction of amino acids". Thesis, London South Bank University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245090.

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32

Humphries, Mark Edward. "Enantioselective synthesis of functionalised amino acids". Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760731.

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33

Penman, June. "GPR55 and N-acyl amino acids". Thesis, University of Dundee, 2013. https://discovery.dundee.ac.uk/en/studentTheses/2e07c280-3a61-4f49-a9da-1fa4ffc79fa5.

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G-protein coupled receptor 55 (GPR55) is a novel lipid sensing receptor activated by the endogenous lipid, lysophosphatidylinositol (LPI) and is reported as a putative cannabinoid receptor. However GPR55 shares limited homology with the two cloned cannabinoid receptors (CB₁ and CB₂) but does exhibit some cannabinoid sensitivity. Recently a family of bioactive lipids, the N-acyl amino acids, are gaining interest due to their structural similarity to endocannabinoids (naturally occurring CB₁ and CB₂ agonists). N-acyl amino acids have little or no affinity for either CB₁ or CB₂ and many have no known biological target at present. This study used a subset of N-acyl amino acids; possessing either a serine or glycine head group attached to varying fatty acid chains; to assess these novel lipids as potential GPR55 ligands. Three cell lines were utilised, a stably transfected HEK293 cell line that overexpresses 3xHA N-terminus tagged hGPR55 (hGPR55-HEK293 cells) and control HEK293 cells. In addition, the DU145 a prostate cancer cell line which is reported to endogenously express GPR55 was investigated. N-acyl amino acid challenge activated GPR55 to promote Ca²⁺ mobilisation, CREB phosphorylation, actin cytoskeletal reorganisation and elongation of focal adhesions. Furthermore GPR55-mediated downstream signalling effectors were studied comparing LPI to the orphan lipid; N oleoyl-L-serine (NOSer). This study highlights that N-acyl amino acids act as GPR55 agonist/partial agonists in hGPR55-HEK293 cells. Both LPI and NOSer exert effects in prostate cancer cells (DU145s) which are GPR55 mediated. GPR55 may exhibit ligand bias as LPI was more efficacious in Ca²⁺ mobilisation. However in the pCREB assay NOSer was more efficacious than LPI. A similar efficacy and potency to either LPI or NOSer was observed in the other assays in both hGPR55-HEK293 and DU145 cells. Furthermore this study is the first where a named GPCR can be assigned for responses that are mediated by NOSer.

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34

Wong, Wai Cheong. "Electroanalysis of amino acids and dithocarbamates". HKBU Institutional Repository, 1994. http://repository.hkbu.edu.hk/etd_ra/40.

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35

Tan, Eng Wui. "Regioselective modification of amino acid derivatives /". Title page, contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09pht1612.pdf.

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36

Van, Kralingen Leon. "Controlled polymerization of amino acid derivatives". Thesis, Link to the Internet, 2008. https://etd.sun.ac.za/jspui/handle/10019/919.

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37

Malešević, Miroslav. "[Beta]-amino [Beta-amino] acids as secondary structure inducers in peptides". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966017811.

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38

Kim, Jin Kyung. "Syntheses of Silanediol Amino acids and alpha-amino-alpha-alkylsilanediol precursors". Diss., Temple University Libraries, 2008. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/16809.

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Abstract (sommario):

Chemistry
Ph.D.
Two research projects are described: studies of the synthesis of alpha-amino-alpha-alkylsilanes, the synthetic precursor of silanediol-based protease inhibitors, and the synthesis and stability evaluation of silanediol amino acids with an unprecedently unhindered silanediol group. Two methods were investigated as approaches to alpha-amino-alpha-alkylsilanes. First, a silicon-substituted aziridine was chosen as the precursor of an alpha-amino-alpha-alkylsilane via ring opening reactions with carbon nucleophiles. Silyl-substituted aziridines 2-24 and 2-30 were prepared via direct lithiation/silylation of aziridine and employed as substrates for ring opening reactions. In spite of many attempts to ring open these silylaziridines and prepare ?-amino-?-alkylsilanes, optimization of the reaction conditions were unsuccessful. Secondly, alpha-chloro-alpha-benzylsilane 3-12 was prepared as the precursor of an alpha-amino-alpha-alkylsilane via lithiation/benzylation. The alkylation at carbon alpha to silicon to give chloromethylsilane 3-14 was successful when using n-butyllithium for lithiation, which could be explained by the steric encumbrance inherent in the structure. Several attempts for nucleophilic displacement of chloride to obtain alpha-chloro-alpha-benzylsilane 3-11 were unsuccessful possibly due to the steric effect as well as the electronic effect of silicon on the alpha carbon which made the chloride less reactive toward nucleophilic substitution. The silanediol amino acid 4-1 was synthesized originally as a potential arginase inhibitor. Although the expected biological activity was not observed, the studies on silanediol-siloxane distribution of the silanediol amino acid revealed the unique properties of this compound. Under basic conditions, the silanediol amino acid was mainly stable in monomeric form. As the pH decreased, the silanediol amino acid gave a mixture of siloxanes which consisted of a variety of stereoisomers. With available instrumental techniques, monomer, dimers and trimers of the silanediol amino acid were identified.
Temple University--Theses

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39

Svennerstam, Henrik. "Amino acid uptake in Arabidopsis : the transporters involved, kinetics of uptake and growth on amino acids /". Umeå : Dept. of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 2008. http://epsilon.slu.se/200850.pdf.

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40

Yu, Heewon. "Pseudopoly(amino acids) : a study of the synthesis and characterization of polyesters made from α-L-amino acids". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/16498.

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41

Ebikeme, Charles E. "Amino acid transporters and amino acid metabolism in trypanosoma brucei brucei". Connect to e-thesis, 2007. http://theses.gla.ac.uk/55/.

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Abstract (sommario):

Thesis (Ph.D.) - University of Glasgow, 2007.
Ph.D. thesis submitted to the Division of Infection and Immunity, Institute of Biomedical and Life Sciences, University of Glasgow, 2007. Includes bibliographical references.

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42

Brotzel, Frank. "Nucleophilicities of Amines, Amino Acids and Pyridines". München : Verl. Dr. Hut, 2008. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=017069126&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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43

Grimminger, Philipp. "Rhenium(V)-Carbohydrate Complexes with Amino Acids". Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-103287.

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44

Rose, Christopher J. "A biomimetic approach to β-amino acids". Thesis, University of Leicester, 2002. http://hdl.handle.net/2381/30072.

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The feasibility of a 1,2-radical mediated migration reaction of the imino group has been investigated as a novel route to β-amino acids. Previously only one example of this reaction had been reported. This study describes a further five examples of this reaction (shown below) which together with analogous studies within our group have allowed us to determine the factors (steric and electronic) important for the migration. The synthesis of β-functionalised α-amino acids and their derivatives via a new strategy involving the C-alkylation of salicylaldehyde imines is also reported. [diagram] R1 = H, Me : R2 = Me, CH(CH3)2, CH2CH(CH3)2 : Ar = 2-hydroxy benzene, pyridoxal, C6F5. The synthesis of enantiopure β-phenylseleno α-amino acids via bis-lactim chemistry was also investigated and the first example of these types of compounds is reported. In addition a number of functionalised imines have been synthesised (shown below) to investigate the nature of the radical intermediates involved in the migration reaction and the results from these studies are described. [diagram] Finally the novel ring opening reaction of an aziridine employing N-bromosuccinimide and benzoyl peroxide chemistry to give an α-brominated-β-iminoester is also reported and the mechanistic relevance to the studies above is discussed.

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45

Roselt, P. D. "Synthesis of side-chain functionalized amino acids". Adelaide Thesis (Ph.D.) -- University of Adelaide, Department of Organic Chemistry, 1993. http://hdl.handle.net/2440/21643.

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46

Mohamed, Nazim. "Synthesis of derivatized oxopiperazines from amino acids". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0016/NQ44518.pdf.

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47

Hall, Gerrit van. "Amino acids, ammonia and exercise in man". [Maastricht : Maastricht : Rijksuniversiteit Limburg] ; University Library, Maastricht University [Host], 1996. http://arno.unimaas.nl/show.cgi?fid=6691.

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48

Millan, Michael John. "The attachment of dyes to amino acids /". Title page, contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phm6448.pdf.

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49

Keen, Stephen Philip. "Metal-mediated manipulation of #alpha#-amino acids". Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299177.

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50

Parsons, Andrew Frederick. "The synthesis of the Kainoid amino acids". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293473.

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