A new synthetic access to bicyclic polyhydroxylated alkaloid analogues from pyranosides
作者:Ning Wang、Li-He Zhang、Xin-Shan Ye
DOI:10.1039/b923180c
日期:——
A facile, versatile and stereoselective synthesis of bicyclic polyhydroxylated alkaloids as castanospermine analogues is described. The synthetic route started from methyl pyranosides. The key steps involved a high-yielding expeditious one-pot tandem reaction from alkenes to N-substituted δ-lactams. The δ-lactams were stereoselectively vinylated to give the dienes, which were followed by the ring-closing
一种简便,通用和立体选择性的双环多羟基化生物碱的合成方法 粟精胺描述了类似物。合成途径从甲基吡喃糖苷开始。关键步骤涉及从烯烃到高产率的快速一锅串联反应ñ取代的δ-内酰胺。δ-内酰胺经立体选择性乙烯基化得到二烯,然后进行闭环复分解反应生成环化产物。所得双环化合物的官能团转化以良好的产率提供了多种多羟基化生物碱。