(4S,5S)-5-[(2S,6S)-6-[(2S,3S,5S)-5-[(1S)-2-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-1-methoxyethyl]-3-(methoxymethoxy)oxolan-2-yl]-4-isocyano-4-(4-methylphenyl)sulfonylheptan-2-yl]-4-(methoxymethoxy)oxolan-2-one 在
三溴化硼 作用下,
以
二氯甲烷 为溶剂,
反应 18.0h,
以40%的产率得到(2S,3aS,3'aS,5R,7S,7'S,7aS,7'aS)-7,7'-dimethyl-2-[(1S,3R)-1,3,4-trihydroxybutyl]spiro[2,3,3a,6,7,7a-hexahydrofuro[3,2-b]pyran-5,5'-3a,6,7,7a-tetrahydro-3H-furo[3,2-b]pyran]-2'-one