A Palladium-Catalyzed Regio- and Stereoselective Four-Component Coupling Reaction
作者:Daniel J. Knapton、Tara Y. Meyer
DOI:10.1021/jo0484068
日期:2005.2.1
Pd(PPh3)4 catalytically assembles sulfenamide, alkyne, carbon monoxide, and diphenyl diselenide regio- and stereoselectively in a one-pot four-component coupling reaction to yield (Z)-β-selenyl acrylamides. The reaction proceeds in good to excellent yields (60−95%) and is tolerant of a range of functional groups on both the nitrogen of the sulfenamide and the alkyne. Moderate selectivities ranging
Pd(PPh 3)4在单锅四组分偶联反应中区域选择性地和立体选择性地催化亚磺酰胺,炔烃,一氧化碳和二苯基二硒化物的组装,从而生成(Z)-β-硒基丙烯酰胺。该反应以良好的产率至极好的收率(60-95%)进行,并且对亚磺酰胺和炔烃的氮原子上的一系列官能团均具有耐受性。尽管反应中硒对硫的初始浓度为2:1,但仍观察到了4:1至7:1β-硒烯基至β-亚磺酰基丙烯酰胺的适度选择性。发现硫属元素的选择性直接取决于CO压力。压力的增加降低了硒对硫的选择性。