Enantioselective Synthesis of (R)-α-Alkylhomoserines and (R)-α-Alkylhomocysteines via Phase-Transfer Catalytic Alkylation
作者:Hyeung-geun Park、Sang-sup Jew、Taek-Soo Kim、Yeon-Ju Lee、Kyoungyim Lee、Byeong-Seon Jeong
DOI:10.1055/s-0028-1087808
日期:2009.3
Efficient enantioselective synthetic methods for ( R)-α-alkylhomoserines and ( R)-α-alkylhomocysteines havebeen developed. The phase-transfer catalytic alkylation of 2-phenyl-5,6-di-hydro-4 H-1,3-oxazine-4-carboxylic acid TERT-butyl ester and 2-phenyl-5,6-dihydro-4 H-1,3-thiazine-4-carboxylic acid TERT-butyl ester, in the presence of N-2′,3′,4′-trifluorobenzylcinchonidinium bromide,gave the corresponding
(R)-α-烷基高丝氨酸和(R)-α-烷基高半胱氨酸的有效对映选择性合成方法已经开发出来。2-苯基-5,6-二氢-4 H-1,3-恶嗪-4-羧酸叔丁酯和2-苯基-5,6-二氢-4 H-的相转移催化烷基化反应1,3-噻嗪-4-羧酸叔丁酯,在N-2',3',4'-三氟苄基辛可啶鎓溴化物存在下,得到相应的烷基化产物,可水解得到(R)-α-烷基高丝氨酸(高达 97% ee)和 (R)-α-烷基高半胱氨酸(高达 91% ee),分别。