Pyranoside Phosphite–Oxazoline Ligands for the Highly Versatile and Enantioselective Ir-Catalyzed Hydrogenation of Minimally Functionalized Olefins. A Combined Theoretical and Experimental Study
作者:Javier Mazuela、Per-Ola Norrby、Pher G. Andersson、Oscar Pàmies、Montserrat Diéguez
DOI:10.1021/ja204948k
日期:2011.8.31
A modular set of phosphite-oxazoline (P,N) ligands has been applied to the title reaction. Excellent ligands have been identified for a range of substrates, including previously challenging terminally disubstituted olefins, where we now have reached enantioselectivities of 99% for a range of substrates. The selectivity is best for minimallyfunctionalized substrates with at least a moderate size difference
[chemical reaction: see text]. A series of phosphite-oxazoline ligands, derived from readily available D-glucosamine, have been used for the first time in the palladium-catalyzed Heckreaction of several substrates with high regio- and enantioselectivities (ee's up to 99%) and improved activities in standard conditions.