chloroformate ester 、 15β,16β-Epoxy-3-methoxy-oestra-1,3,5(10)trien-17β-ol 在
吡啶 作用下,
以
苯 为溶剂,
以33%的产率得到Carbonic acid 2-hydroxy-ethyl ester (8R,9S,13S,14S,15S,16S,17R)-3-methoxy-13-methyl-6,8,9,11,12,13,14,15,16,17-decahydro-7H-20-oxa-cyclopropa[15,16]cyclopenta[a]phenanthren-17-yl ester