作者:Yao-Hua Zhu、Pierre Vogel
DOI:10.1055/s-2001-9698
日期:——
The 2,3,4,6-tetra-O-[(tert-butyl)dimethylsilyl]-C-beta -D- galactopyranosylformaldehyde (2,6-anhydro-1,3,4,6-tetra-O-[(tert-butyl)dimethylsilyl]-D-glycero-L-man no-heptose, 2) was condensed with isolevoglucosenone (3) in the presene e of Et(2)AII to give 1,6-anhydro-3-C- (1R)-2,6-anhydro-3,4,5,7-tetra-O-[(tert-butyl)dimethylsilyl]-D-glycero- L-manno-heptitol-1-C-yl}-2,3-dideoxy-beta -D-glycero-he
2,3,4,6-四-O-[(叔丁基)二甲基甲硅烷基]-C-β-D-吡喃半乳糖基甲醛(2,6-脱水-1,3,4,6-四-O-[(叔丁基)二甲基甲硅烷基]-D-甘油-L-man no-heptose,2)与异左旋葡萄糖酮(3)在Et(2)AII的存在e中缩合得到1,6-脱水-3-C- (1R)-2,6-脱水-3,4,5,7-四-O-[(叔丁基)二甲基甲硅烷基]-D-甘油-L-甘露糖-庚糖醇-1-C-基}-2, 3-dideoxy-β-D-glycero-hex-2-enopyranos-4-ulose (8)。BnONHBn 与 8 的非对映选择性共轭加成,然后用 LiBH4 非对映选择性酮还原并用 Me3SiSPh/ZnI2 处理,提供苯基 3-C-(1R)-2,6-anhydro-3,4,5,7-tetra-O [(叔丁基)二甲基甲硅烷基]-D-glyce ro-L-manno-heptitol-1-C-yl}-2-[