(3S,4R,7R,9S,10S,13S,14S,26S)-13-ethenyl-7-methyl-19,19-dioxo-2-oxa-19lambda6-thiapentacyclo[19.2.2.13,10.04,9.014,26]hexacosa-1(24),11,21(25),22-tetraen-15-one 在
二溴二氟甲烷 、 KOH/Al
2O
3 作用下,
以
二氯甲烷 、
叔丁醇 为溶剂,
以95%的产率得到(13R,14aS,14bS,17S,18S,18aS,19S,19aR,Z)-13-methyl-17-vinyl-12,13,14,14a,14b,17,18,18a,19,19a-decahydro-11H-2-oxa-1(9,8)-fluorena-3(1,4)-benzenacyclooctaphan-4-en-8-one