Palladium-catalyzedasymmetricallylicalkylation of 1,3-diphenyl-2-propenyl acetate (4) with a dimethyl malonate-BSA-LiOAc system has been successfully carried out in the presence of a new chiral prolinol-derived aminophosphine ligand (3e) in good yield with good enantioselectivity (up to 96% ee).
Formation of Cyclic Phosphonium Salts in Trichlorosilane Reduction of Phosphine Oxides Bearing a Pendant Hydroxyl Group and Their Hydrolysis to Cyclic Phosphine Oxides
作者:Zuo-Gang Huang、Biao Jiang、Ke-Jun Cheng
DOI:10.1080/10426500701280137
日期:2007.6.1
An unusual ring closure to cyclicphosphoniumsalts was observed during trichlorosilane reduction of phosphine oxides with a pendant hydroxylmethyl group. Alkaline hydrolysis of the cyclicphosphoniumsalts afforded a cyclic phosphine oxide and a ring-fission product.