[(1R,3'R,4S,5'S,6S,7S,8S,9R,10R,12S,13S,18S)-3'-acetyloxy-5'-[[tert-butyl(diphenyl)silyl]oxymethyl]-8-hydroxy-5',7,9,13-tetramethyl-16-oxospiro[5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icos-2-ene-6,2'-oxolane]-10-yl] acetate 在
phenyltrimethylammonium tribromide 作用下,
以
四氢呋喃 为溶剂,
反应 0.2h,
以90.6%的产率得到