Kinetic resolution of chiral racemic (1R*,3aS*,7aS*)-hexahydro-2-oxobenzofuran-3-ylacetic acid ethyl ester was achieved by means of immobilized Lipozyme®. At low conversion values, the (−)-acid was isolated with 84% ee, while at high conversion values the (+)-ester was obtained with 98% ee. Their configurations were determined by transformation of the acid into the corresponding α-methylene derivative of known absolute configuration.
通过固定化 Lipozyme® 实现了手性外消旋 (1R*,3aS*,7aS*)-六氢-2-氧代
苯并呋喃-3-基
乙酸乙酯的动力学拆分。在低转化值下,以 84% ee 分离出 (-)-酸,而在高转化值下,获得了 98% ee 的 (+)-酯。它们的构型是通过将酸转化为已知绝对构型的相应α-亚甲基衍
生物来确定的。