Acyclic Stereoselective Boron Alkylation Reactions for the Asymmetric Synthesis of β-Substituted α-Amino Acid Derivatives
作者:Martin J. O'Donnell、Jeremy T. Cooper、Mary M. Mader
DOI:10.1021/ja0298794
日期:2003.3.1
Optically active syn- or anti-β-substituted-α-amino acid derivatives are prepared in 94 to ≥99% ee and 66−98% ds by reaction of the Schiff base acetate of glycine tert-butyl ester with chiral, nonracemic B-alkyl-9-BBN derivatives in the presence of the Cinchona alkaloid, cinchonidine (CdOH) or cinchonine (CnOH), base, and lithium chloride.
通过甘氨酸叔丁酯的席夫碱乙酸酯与手性非外消旋 B-反应,以 94% 至≥99% ee 和 66-98% ds 制备光学活性的顺式或反式 β-取代的-α-氨基酸衍生物在金鸡纳生物碱、辛可尼丁 (CdOH) 或辛可宁 (CnOH)、碱和氯化锂存在下的烷基-9-BBN 衍生物。