Studies related to carba-pyranoses: a radical decarboxylation approach to monocarba-disaccharidesA part of this work was reported in preliminary form, see ref. 1.
作者:David S. Larsen、Roger J. Lins、Richard J. Stoodley、Nicholas S. Trotter
DOI:10.1039/b404688a
日期:——
(1--> 1), (1--> 3) and (1--> 4) acetal-linked monocarba-disaccharides have been synthesised from a series of glucosylated gamma- and delta-lactonic acids prepared from common intermediate, obtained from the Diels-Alder reaction of maleic anhydride and (E)-1-(2',3',4',6'-tetra-O-acetyl-beta-D-glucopyranosyloxy)-3-(trimethylsiloxy)bu ta-1,3-diene 1. Thiohydroxamic ester 14, prepared from gamma-lactonic
制备了氨基吡喃糖环的L-木糖基,D-阿拉伯糖基和L-基构型。用叔丁基硫醇或三苯甲基硫醇,二甲基硫醚,氧和光处理硫代异羟肟酸酯14和17得到醇20和22。随后氢化铝锂还原和乙酰化得到单碳二糖1,4,6-三-O-乙酰基-3-O- [2',3',4',6'-四-O-乙酰基-β-D-吡喃葡萄糖基] -2-脱氧-5a-氨基-β-L-阿拉伯糖基己糖21和1 2,4,6-四-O-乙酰基-3-O-(2',3',4',6'-四-O-乙酰基-β-D-吡喃吡喃糖基)-5a-氨基-β-L-吡喃葡萄糖23。