(E)-(3S,4S)-3,4-Bis-(tert-butyl-dimethyl-silanyloxy)-6-iodo-hex-5-enoic acid (R)-1-methyl-3-oxo-propyl ester 在
chromium dichloride 、 nickel dichloride 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成
(E)-(4S,5S,8S,10R)-4,5-Bis-(tert-butyl-dimethyl-silanyloxy)-8-hydroxy-10-methyl-3,4,5,8,9,10-hexahydro-oxecin-2-one