A short and efficient synthesis of α-C-(1 → 3)-linked disaccharides containing deoxyhexopyranoses
作者:Petr Štěpánek、Ondřej Vı́ch、Ladislav Kniežo、Hana Dvořáková、Pavel Vojtı́šek
DOI:10.1016/j.tetasy.2004.01.023
日期:2004.3
Ozonolysis of peracetylated α-d-glucopyranosylprop-2-ene, followed by the reaction of the formed ozonide with (thiazol-2-yl)carbonylmethylenetriphenyl phosphorane, afforded substituted 1-oxa-1,3-butadiene, which by a hetero-Diels–Alder reaction with ethyl vinyl ether gave a 1:1 mixture of two diastereoisomeric dihydropyran derivatives. These, after replacement of the acetyl protecting groups by benzyl
将过乙酰化的α-d-吡喃葡萄糖基丙-2-烯进行臭氧分解,然后使所形成的臭氧化物与(噻唑-2-基)羰基亚甲基三苯基膦烷反应,得到取代的1-oxa-1,3-丁二烯,其通过杂Diels –与乙基乙烯基醚的Alder反应得到两种非对映异构体二氢吡喃衍生物的1:1混合物。在用苄基取代乙酰保护基之后,将它们通过色谱分离,并将它们的噻唑取代基转化为醛基。随后的硼氢化产生α- C-(1→3)-连接的二糖,其中d-葡萄糖通过亚甲基桥与2,3-二脱氧-阿拉伯糖连接。-d-或l-构型的六吡喃糖。所获得的化合物的结构已经通过NMR光谱法和X射线晶体学分析确认。