Asymmetric Michael reaction of an α-cyano Weinreb amide catalyzed by a rhodium complex with trans-chelating chiral diphosphine PhTRAP
作者:Masaya Sawamura、Hitoshi Hamashima、Hajime Shinoto、Yoshihiko Ito
DOI:10.1016/0040-4039(95)01295-s
日期:1995.9
Asymmetric Michael reaction of N-methoxy-N-methyl-2-cyanopropionamide with vinyl ketones or acrolein in the presence of 0.1–1 mol% of a rhodium catalyst prepared in situ from Rh(acac)(CO)2 and a trans-chelating chiral diphosphine ligand (S,S)-(R,R)-PhTRAP gave optically active Michael adducts with high enantiomeric excesses (89–94%) in high yields. The adducts with methyl vinyl ketone was transformed