在
三溴化硼 作用下,
以
二氯甲烷 为溶剂,
以46%的产率得到Acetic acid (2S,3S,3aR,4S,6aS,7aR,11R,11aR,11bS,11cR)-11c-(tert-butyl-diphenyl-silanyloxymethyl)-2,11-dihydroxy-3,8,11a-trimethyl-1,5,10-trioxo-1,2,3,3a,4,5,6a,7,7a,10,11,11a,11b,11c-tetradecahydro-6-oxa-benzo[de]anthracen-4-yl ester