Enantiocomplementary Resolution of 2-Phenylthio-2-cyclopentenol and 2-Phenylthio-2-cyclohexenol Using the Same Lipase
作者:Seiichi Takano、Osamu Yamada、Hirokazu Lida、Kunio Ogasawara
DOI:10.1055/s-1994-25529
日期:——
Both racemic 2-phenylthio-2-cyclopentenol (±)-(3a) and 2-phenylthio-2-cyclohexenol (±)-(3b) afford the corresponding (R)-acetates (R)-4a,b and the unreacted (S)-alcohols (S)-3a,b, respectively, in excellent optical and chemical yields on treatment with vinyl acetate in the presence of lipase PS in dichloromethane. On the other hand, both racemic acetates (±)-4a,b obtained from racemic 2-phenylthio-2-cyclopentenol (±)-(3a) and 2-phenylthio-2-cyclohexenol (±)-(3b) afford the corresponding (R)-alcohols (R)-3a,b and the unreacted (S)-acetates (S)-4a,b, respectively, in excellent optical and chemical yields on stirring in a phosphate buffer-acetone solution in the presence of the same lipase.
手性混合物2-苯硫-2-环戊醇(±)-(3a)和2-苯硫-2-环己醇(±)-(3b)在二氯甲烷中与醋酸乙烯在PS脂肪酶存在下反应,分别得到相应的(R)-乙酸酯(R)-4a,b和未反应的(S)-醇(S)-3a,b,光学和化学产率均很高。另一方面,从手性混合物2-苯硫-2-环戊醇(±)-(3a)和2-苯硫-2-环己醇(±)-(3b)获得的手性混合物乙酸酯(±)-4a,b,在同样的脂肪酶存在下,在磷酸盐缓冲-丙酮溶液中搅拌,分别得到相应的(R)-醇(R)-3a,b和未反应的(S)-乙酸酯(S)-4a,b,光学和化学产率均很高。