Enantioselective Synthesis of (R)- and (S)-α-Alkylcysteines via Phase-Transfer Catalytic Alkylation
摘要:
We reported efficient enantioselective synthetic methodologies for (R)-alpha-alkylcysteines and (S)-alpha-alkylcysteines. The phase-transfer catalytic alkylation of 2-phenyl-2-thiazoline-4- carboxylic acid tert-butyl ester and 2-o-biphenyl-2-thiazoline-4-carboxylic acid tert-butyl ester, in the presence of chiral catalysts ( 1 or 2), gave the corresponding alkylated products, which could be hydrolyzed to provide (R)-alpha-alkylcysteines (67 -> 99% ee) and (S)-alpha-alkylcysteines (66-88% ee), respectively.
Enantioselective Synthesis of (<i>R</i>)- and (<i>S</i>)-α-Alkylcysteines via Phase-Transfer Catalytic Alkylation
作者:Taek-Soo Kim、Yeon-Ju Lee、Byeong-Seon Jeong、Hyeung-geun Park、Sang-sup Jew
DOI:10.1021/jo061107t
日期:2006.10.1
We reported efficient enantioselective synthetic methodologies for (R)-alpha-alkylcysteines and (S)-alpha-alkylcysteines. The phase-transfer catalytic alkylation of 2-phenyl-2-thiazoline-4- carboxylic acid tert-butyl ester and 2-o-biphenyl-2-thiazoline-4-carboxylic acid tert-butyl ester, in the presence of chiral catalysts ( 1 or 2), gave the corresponding alkylated products, which could be hydrolyzed to provide (R)-alpha-alkylcysteines (67 -> 99% ee) and (S)-alpha-alkylcysteines (66-88% ee), respectively.