Building blocks for the synthesis of glycosyl-myo-inositols involved in the insulin intracellular signalling process
作者:Amparo Zapata、Manuel Martín-Lomas
DOI:10.1016/0008-6215(92)85041-w
日期:1992.10
Glycosylation of (+/-)-l-0-benzyl-2,3:5,6-di-0-isopropylidene-myo-inositol (4) with 6-O-acetyl-4-O-allyl-2-azido-3-0-benzyl-2-deoxy-beta-D-glucopyranosyl trichloroacetimidate (6) gave the 4-O-(2-amino-2-deoxy-alpha-D-glucopyranosyl)-myo-inositol derivative (9) as a mixture of diastereoisomers which could be resolved by chromatography. Likewise alpha-glycosylation of 4 with 6-0-acetyl-2-azido-3-0-benzoyl-2-de-oxy-4-0-(2,3,4,6-tetra-0-acetyl-beta-D-galactopyranosyl)-D-glucopyranosyl trichloroacetimidate (10) gave the corresponding pseudotrisaccharide derivative 16 as a mixture of diastereomers which could be resolved partially by chromatography. alpha-Glycosylation of enantiomerically pure 2,3:5,6- (18) and 2,3:4,5-di-0-isopropylidene-1-0-menthoxycarbonyl-myo-inositol (19) with 3,4,6-tri-O-acetyl-2-azido-2-deoxy-D-glucopyranosyl trichloroacetimidate (20) gave the pseudodisaccharide derivatives 21 and 22, respectively. Likewise, alpha-glycosylation of 18 with 10 afforded a pseudotrisaccharide derivative (23).