Tetrasubstituted C-Glycosylidenes and C-Glycosyl Compounds from Di- and Monobromo-Substituted exo-Glycals
作者:Hoang-Trang Tran Thien、Alexandre Novoa、Nadia Pellegrini-Moïse、Françoise Chrétien、Claude Didierjean、Yves Chapleur
DOI:10.1002/ejoc.201100949
日期:2011.12
Efficient methods for functionalization of readily available exo-glycals have been developed. Sequential palladium-catalysed cross-coupling of dibromo-substituted exo-glycals was first explored and allowed the formation of new disubstituted exo-glycals as single stereoisomers. Bromination of furano- and pyrano-methoxycarbonyl-exo-glycals led to a new series of monobrominated derivatives. These vinylic
已经开发了用于容易获得的外-糖基官能化的有效方法。首次探索了连续钯催化的二溴取代外糖醇的交叉偶联,并允许形成新的双取代外糖醇作为单一立体异构体。呋喃-和吡喃-甲氧基羰基-exo-glycals 的溴化导致了一系列新的单溴化衍生物。这些乙烯基溴化物被用于通过钯催化反应形成碳-碳键,从而产生了一系列以前未知的外加糖。甲氧基羰基官能团的进一步化学操作和环外双键的立体选择性氢化导致具有高度立体控制的 C-糖基化合物。