已经开发了一种由亚胺,卤代芳基和一氧化碳合成β-内酰胺的钯催化多组分方法。该转化通过由Pd(P t Bu 3)2介导的两个串联催化羰基化反应进行,并提供了从五种单独的试剂制备这些产物的途径。通过底物的系统变化可以产生各种各样的多取代的β-内酰胺。该方法还可以扩展为使用碘取代的亚胺以高产率和选择性生产新型螺环β-内酰胺。
A palladium-catalyzed synthesis of (hetero)aryl-substituted imidazoles from aryl halides, imines and carbon monoxide
作者:Jevgenijs Tjutrins、Bruce A. Arndtsen
DOI:10.1039/c6sc04371b
日期:——
We describe here a tandem catalytic route to prepare imidazoles in a single operation from aryliodides, imines and CO. The reaction involves a catalytic carbonylation of aryl halides with imines to form 1,3-dipoles, which undergo spontaneous 1,3-dipolar cycloaddition. Overall, this offers an alternative to couplingreactions to construct the (hetero)aryl-imidazole motif, where variation of the building