Highly Enantioselective Synthesis of (<i>S</i>)-α-Alkyl-α,β-diaminopropionic Acids via Asymmetric Phase-Transfer Catalytic Alkylation of 2-Phenyl-2-imidazoline-4-carboxylic Acid<i>tert</i>-Butyl Esters
作者:Yohan Park、Sukhoon Kang、Young Ju Lee、Taek-Soo Kim、Byeong-Seon Jeong、Hyeung-geun Park、Sang-sup Jew
DOI:10.1021/ol9013552
日期:2009.8.20
An efficient enantioselective synthetic method for (S)-α-alkyl-α,β-diaminopropionic acid is reported. The asymmetric phase-transfer catalytic alkylation of N(1)-Boc-2-phenyl-2-imidazoline-4-carboxylic acid tert -butyl ester in the presence of chiral quaternary ammonium catalyst gave the corresponding alkylated products (93−98% ee) which could be transformed to enantioenriched α-alkyl-α,β-diaminopropionic
报道了一种有效的对映选择性合成方法,用于(S)-α-烷基-α,β-二氨基丙酸。N(1)-Boc-2-苯基-2-咪唑啉-4-羧酸叔丁酯在手性季铵催化剂存在下的不对称相转移催化烷基化反应得到相应的烷基化产物(93-98%ee ),可以将其转化为对映体富集的α-烷基-α,β-二氨基丙酸。