enantiomeric form and cyclopentanecarbonitriles 10 and 15, were prepared efficiently through lipase catalysed enantioselective hydrolysis of meso-diesters 5a-c or transesterification of their parent diol 2 with vinyl acetate in an organic solvent providing chiral monoesters 6a-c or ent-6a of>99% ee in the crucial step. The combined HLADH catalysed and chemical oxidation of 2 resulted in (−)-1 of 74%
对映体纯的手性结构单元,内酯1在任一对映体形式和cyclopeNTanecarbonitriles 10和15,被有效地制备通过
脂肪酶催化的对映选择性
水解的内消旋-diesters 5A-C或它们的母体二醇的酯交换反应2在提供手性单酯的有机溶剂中与
乙酸乙烯酯图6A-C或ENT - 6a中的>在关键步骤99%ee的。结合的H
LADH催化和2的
化学氧化导致(-)- 1的对映体纯度为74%。