(Z,2R,3S,8R,9R)-9-tert-butyldiphenylsilanyloxymethyl-8-chloro-3-hydroxy-2-p-toluenesulfonyloxymethyl-2,3,4,7,8,9-hexahydro-oxonine 、
甲基锂 在
copper(l) cyanide 作用下,
以
乙醚 为溶剂,
以70%的产率得到(Z,1R,3R,4R,9S)-3-tert-butyldiphenylsilanyloxymethyl-4-chloro-2,10-dioxa-bicyclo[7.2.0]undec-6-ene