Practical synthesis of O-β-d-mannopyranosyl-, O-α-d-mannopyranosyl-, and O-β-d-glucopyranosyl-(1→4)-O-α-l-rhamnopyranosyl-(1→3)-d-galactoses
作者:Vitali I. Betaneli、Michael V. Ovchinnikov、Leon V. Bachinowsky、Nikolay K. Kochetkov
DOI:10.1016/s0008-6215(00)85552-4
日期:1980.9
The koenigs-Knorr glycosylation of 4,6-O-ethylidene-1,2-O-isopropylidene-3-O-(2,3-O-isopropylidene-α- l -rhamnopyranosyl)-α- d -galactopyranose (3) by 4,6-di-O-acetyl-2,3-O-carbonyl-α- d -mannopyranosyl bromide (10), as well as Helferich glycosylations of 3 by tetra-O-acetyl-α- d -mannopyranosyl and -α- d -glucopyranosyl bromides, proceeded smoothly to give high yields of trisaccharide derivatives (12
摘要4,6-O-亚乙基-1,2-O-异亚丙基-3-O-(2,3-O-异亚丙基-α-l-鼠李糖基吡喃糖基)-α-d-吡喃半乳糖的koenigs-Knorr糖基化作用(3 )由4,6-二-O-乙酰基-2,3-O-羰基-α-d-甘露吡喃糖基溴化物(10)以及四-O-乙酰基-α-d-甘露吡喃糖基和3的Helferich糖基化-α-d-吡喃葡萄糖基溴化物平稳进行,得到高产率的三糖衍生物(12、16和17)。已经开发了将12、16和17转化为相应三糖的α-癸酸酯的有效方法。然后,Zemplen脱乙酰化可分别从3获得53、52和62%的标题三糖。这是一条通往1,4,6-tri-O-乙酰-2,3-O-羰基-α的新途径-建议使用d-甘露吡喃糖。