o-D-galacto-β-D-galacto-tridecopyranoside and its α-L-altro epimer in a 61% yield. The debenzylation of 25 by hydrogenolysis with palladium black, followed by homogeneous hydrogenation with tris(triphenylphosphine)chlororhodium(I) and the chromatographic isolation of the desired diastereomer, gave, after acetylation, methyl 7,9-di-O-acetyl-2,4,6,8,10,13-hexadeoxy-11,12-O-isopropylidene-4,6,8,10-te
3-O-Benzyl-
2,4,7-trideoxy-5,6-O-isopropylidene-
2,4-di-C-methyl-L-glycero-D-galacto-heptose (6) 通过 16 个步骤合成4,6-O-benzylidene-3-deoxy-3-C-methyl-α-D-altropyranoside (7)。6 与
甲基 2,4,6,7-tetradeoxy-6-lithio-4-C-methyl-3-O-methyl-α-L-arabino-(E)-6-heptenopyranoside 的缩合,衍生自 7,得到
甲基 9-O-benzyl-
2,4,6,8,10,13-hexadeoxy-11,12-O-isopropylidene-4,8,10-tri-C-methyl-3-的混合物 (25) O-
甲基-6-亚
甲基-L-
甘油-
D-半乳糖-β-
D-半乳糖-三
吡喃糖苷及