Stereocontrolled palladium(0) catalysed cyclisation and cyclisation/carbonylation of pseudoglycal derivatives
作者:Cedric W. Holzapfel、Gerhard J. Engelbrecht、Lizel Marais、Francois Toerien
DOI:10.1016/s0040-4020(97)00012-4
日期:1997.3
Pd(0) catalysed cyclisations of selected pseudoglycal 1,6-diene and 1,6-enyne derivatives provided annulated pyranoside products in a highly stereospecific fashion. Carbon monoxide insertion reactions of the cyclised σ-Pd intermediates afforded bicyclic carboxylic acids and/or bis-annulated cyclopentanone or -pentenone monosaccharide derivatives with the concomitant stereocontrolled formation of up
Pd(0)催化的选定假糖1,6-二烯和1,6-烯炔衍生物的环化反应以高度立体定向的方式提供了环吡喃糖苷产品。环化的σ-Pd中间体的一氧化碳插入反应可提供双环羧酸和/或双环化的环戊酮或-戊烯酮单糖衍生物,并伴随立体控制地形成多达三个CC键。