重氮甲烷 、 (3R,4S,5R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-hydroxy-3-methoxy-5-methyl-5-((E)-4-trimethylsilanyl-but-1-en-3-ynyl)-cyclopent-1-enecarboxylic acid allyl ester 以72%的产率得到(3R,4S,5R)-4-(tert-Butyl-dimethyl-silanyloxy)-2,3-dimethoxy-5-methyl-5-((E)-4-trimethylsilanyl-but-1-en-3-ynyl)-cyclopent-1-enecarboxylic acid allyl ester