Controlling Chemoselectivity in Vinyl and Allylic C−X Bond Activation with Palladium Catalysis: A p<i>K</i><sub>a</sub>-Based Electronic Switch
作者:Michael G. Organ、Elena A. Arvanitis、Craig E. Dixon、Jeremy T. Cooper
DOI:10.1021/ja011508k
日期:2002.2.1
the same Pd catalyst can be used to effect allylic substitution or vinylic cross-coupling reactions selectively and interchangeably on polyfunctionalized olefin building blocks despite the differences in reaction mechanism. This was achieved by altering the pK(a) of the conjugate acid of the allylic leaving group while keeping the vinylcoupling partner constant. In the case of 2,3-dibromo-1-propene