(2S,3S,3aR,4S,6aS,7aR,11R,11aR,11bS,11cR)-11c-(tert-Butyl-diphenyl-silanyloxymethyl)-4-hydroxy-11-methoxy-2-methoxymethoxy-3,8,11a-trimethyl-2,3,3a,4,7,7a,11,11a,11b,11c-decahydro-6aH-6-oxa-benzo[de]anthracene-1,5,10-trione 在
三溴化硼 作用下,
以67%的产率得到(2S,3S,3aR,4S,6aS,7aR,11R,11aR,11bS,11cR)-11c-(tert-Butyl-diphenyl-silanyloxymethyl)-2,4,11-trihydroxy-3,8,11a-trimethyl-2,3,3a,4,7,7a,11,11a,11b,11c-decahydro-6aH-6-oxa-benzo[de]anthracene-1,5,10-trione