Synthesis of 4,6:2′,3′:4′,6′-tri-O-cyclohexylidene-α,α′-trehalose 2-palmitate: an intermediate for the synthesis of mycobacterial 2,3
作者:Paul A. Wallace、David E. Minnikin
DOI:10.1016/0008-6215(94)00164-2
日期:1994.10
and 4′,6′-positions, leaving the 2,3-positions free for subsequent acylation. Isopropylidene and ethylidene acetals were studied, with the formation of a small amount of 4,6:2′,3′:4′,6′-tri-O-isopropylidene- α,α′-trehalose. 4,6:4′,6′-Di-O-benzylidene-2′,3′-O-(tetraphenyldisiloxane-1,3-diyl)-α,α′- trehalose 2,3-diacetate was prepared in low yield. 1,1-Dimethoxycyclohexane reacted with methyl α- d -glucopyranoside
摘要目的是通过在4,6-,2',3'-和4',6'-位上放置各种缩醛或相关的保护基来“三保护”海藻糖,而使2,3-位自由用于随后的酰化。研究了异亚丙基和亚乙缩醛,形成了少量的4,6:2',3':4',6'-三-O-异亚丙基-α,α'-海藻糖。以低收率制备了4,6:4',6'-二-O-亚苄基-2',3'-O-(四苯基二硅氧烷-1,3-二基)-α,α'-海藻糖2,3-二乙酸酯。1,1-二甲氧基环己烷与甲基α-d-吡喃葡萄糖苷反应,得到4,6-O-环己叉基衍生物,分离为二乙酸酯。缩醛的温和酸裂解得到2,3-二乙酸酯。4,6:2',3':4',6'-Tri-O-环己叉基-α,α'-海藻糖是α,α'-海藻糖与1,1-二甲氧基环己烷之间反应的主要产物。2,3:4,6:2',3':4',还以较低的产率分离出6'-四-O-环己叉基-,4,6:4',6'-二-O-环己叉基-和4,6-O-环己叉基-α,α'-