Acetic acid (3S,4S,5R,6S,8S,9S,10R,13R,14S,17R)-17-((R)-1,5-dimethyl-hexyl)-3-methoxy-10,13-dimethyl-hexadecahydro-20-oxa-cyclopropa[5,6]cyclopenta[a]phenanthren-4-yl ester 在
吡啶 、
三氟化硼乙醚 作用下,
生成
Acetic acid (3S,4S,5S,6S,8S,9S,10R,13R,14S,17R)-17-((R)-1,5-dimethyl-hexyl)-5-hydroxy-3-methoxy-10,13-dimethyl-4-(toluene-4-sulfonyloxy)-hexadecahydro-cyclopenta[a]phenanthren-6-yl ester