(5S)-4-tert-butoxycarbonylamino-6-cyclohexyl-3,3-dimethyl-4-oxohexanoic acid methylester 、 alkaline earth salt of/the/ methylsulfuric acid 以
异丙醇 为溶剂,
反应 0.5h,
以21%的产率得到(5R)-5-<(1S)-1-tert-butoxycarbonylamino-2-cyclohexylethyl>-4,4-dimethyl-tetrahydrofuran-2-one