Endocyclic cleavage of glycosides. VI. Substituent effects of the alkylative endocyclic cleavage of glycosides
作者:Roger Olsson、Ulf Berg、Torbjörn Frejd
DOI:10.1016/s0040-4020(98)00120-3
日期:1998.4
A number of pentopyranoside derivatives were treated with Me3Al in order to investigate the influence of structural parameters on the methyl group transfer in the endocyclic alkylative cleavage reaction of these substrates. A cyclic CH…O hydrogen bonded model is suggested as an intermediate, which is used to explain the stereoselectivities for different substrates. In several cases the diastereoselectivities
为了研究结构参数对这些底物的环内烷基化裂解反应中甲基转移的影响,对许多戊吡喃糖苷衍生物进行了Me 3 Al处理。建议使用环状CH…O氢键模型作为中间体,用于解释不同底物的立体选择性。在某些情况下,非对映选择性优于9:1。