Squaramide-catalysed asymmetric cascade reactions of 2,3-dioxopyrrolidines with 3-chlorooxindoles
作者:Jiang-Bo Wen、Da-Ming Du
DOI:10.1039/c9ob02663k
日期:——
A highly efficient method for the enantioselective construction of dispirocyclic compounds has been developed by the squaramide-catalysed asymmetric Michael addition/cyclization cascade reaction of 2,3-dioxopyrrolidines with 3-chlorooxindoles. The corresponding chiral dispiro[indoline-3,1'-cyclopropane-2',3''-pyrrolidine]-2,4'',5''-triones were obtained in high yields with excellent stereoselectivities
通过2,3-二氧杂吡咯烷与3-氯氧吲哚的方胺催化的不对称迈克尔加成/环化级联反应,已经开发出一种高效的对映体选择性构建双螺环化合物的方法。相应的手性双螺[吲哚啉-3,1'-环丙烷-2',3''-吡咯烷] -2,4'',5''-三酮以优异的立体选择性获得(最高收率94%, > 25:1 dr和> 99%ee)。此外,克级实验证实了当前反应的可靠性,并且已经实现了产物的进一步有效转化。