(6R,7R,7aS,10aR,11R)-2-(tert-Butyl-dimethyl-silanyloxy)-11-hydroxymethyl-7-methyl-9,9-diphenyl-6-[(triisopropylsilanyl)-ethynyl]-7,7a,10a,11-tetrahydro-6H-[1,3]dioxolo[4,5-j]phenanthridine-5-carboxylic acid methyl ester 在
草酰氯 、
二甲基亚砜 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
以95%的产率得到(6R,7R,7aS,10aR,11S)-2-(tert-Butyl-dimethyl-silanyloxy)-11-formyl-7-methyl-9,9-diphenyl-6-[(triisopropylsilanyl)-ethynyl]-7,7a,10a,11-tetrahydro-6H-[1,3]dioxolo[4,5-j]phenanthridine-5-carboxylic acid methyl ester