Syntheses of isotopically labelled L-α-amino acids with an asymmetric centre at C-3
作者:John R. Harding、Rachael A. Hughes、Nicholas M. Kelly、Andrew Sutherland、Christine L. Wilis
DOI:10.1039/b005172l
日期:——
Approaches are described to the synthesis of a series of isotopicallylabelled L-α-amino acids each with an asymmetric centre at C-3, including isoleucine, allo-isoleucine, threonine and allo-threonine. The methods may be simply adapted for the selective incorporation of an isotopiclabel at each site of L-valine including the selective labelling of either diastereotopic methyl group with carbon-13
Asymmetric Diels-Alder cycloaddition reactions with chiral .alpha.,.beta.-unsaturated N-acyloxazolidinones
作者:David A. Evans、K. T. Chapman、J. Bisaha
DOI:10.1021/ja00212a037
日期:1988.2
Asymmetric alkylation reactions of chiral imide enolates. A practical approach to the enantioselective synthesis of .alpha.-substituted carboxylic acid derivatives
作者:D. A. Evans、M. D. Ennis、D. J. Mathre
DOI:10.1021/ja00370a050
日期:1982.3
Asymmetric construction of two contiguous stereocenters by diastereoface differentiating addition reaction of thiols to chiral imides: Formal synthesis of (+)-diltiazem
A high degree of diastereoselectivity has been achieved on the asymmetric construction of two contiguous stereocenters by the conjugate addition of thiols to alpha,beta-unsaturated imides possessing Evans's chiral auxiliary. Addition reactions of thiophenol to chiral E- and Z-2-methylcrotonyl imides 4 proceeded with high diastereoface selectivities. Diastereoselectivities were discussed when E- and Z-imides 4 and 5 were used as the substrates. A successful application was demonstrated by the formal synthesis of a clinically useful cardiac drug, (+)-diltiazem. (C) 1997, Elsevier Science Ltd.
Evans, David A.; Chapman, Kevin T.; Hung, Deborah Tan, Angewandte Chemie, 1987, vol. 99, # 11, p. 1197 - 1199
作者:Evans, David A.、Chapman, Kevin T.、Hung, Deborah Tan、Kawaguchi, Alan T.