Synthesis and catalytic application of novel binaphthyl-derived phosphorous ligands

Abstract

We describe our recent achievements in the synthesis of chiral phosphorous ligands and their application in catalytic asymmetric hydrogenation reactions. Special attention is given to the development of novel binaphthophosphepine ligands. Starting from enantiomerically pure 1,1′-binaphthol or 2,2′-dimethyl-1,1′-binaphthyl and the building blocks A or B, new chelating P-ligands have been synthesized in one step in good to excellent yields (68-95%). The resulting chiral bidentate phosphines, phosphites and phosphonites were tested in various asymmetric hydrogenation benchmark reactions. Interestingly, small structural changes within the ligands exhibit a significant influence on the enantioselectivity of the hydrogenation reactions. ©ARKAT USA, Inc.