Highly Chemoselective Direct Crossed Aliphatic−Aromatic Acyloin Condensations with Triazolium-Derived Carbene Catalysts
作者:Sarah E. O’Toole、Christopher A. Rose、Sivaji Gundala、Kirsten Zeitler、Stephen J. Connon
DOI:10.1021/jo101791w
日期:2011.1.21
that triazolium precatalysts promote (in the presence of base) highlychemoselectivecrossed acyloin condensation reactions between aliphatic and ortho-substituted aromaticaldehydes. An o-bromine atom can serve as a temporary directing group to ensure high chemoselectivity (regardless of the nature of the other substituents on the aromatic ring) which then can be conveniently removed. The process is