Asymmetric 1,4-Addition of Arylboronic Acids to α,β-Unsaturated<i>N</i>-Acylamides Catalyzed by Dicationic Palladium(II)–(<i>S</i>,<i>S</i>)-Chiraphos Complex
Palladium-catalyzed 1,4-addition of arylboronic acids to unsaturated carbonyl compounds has been limitedly used for ketone and aldehyde derivatives. It was found that reaction with N-acylamides exceptionally proceeds with high yields and high enantioselectivities. A dicationic palladium–chiraphos catalyst 3 gave optically active β-arylamides of up to 98% ee.
We have successfully developed a highly enantioselective hydrogenation of various 3-aryl and 3-methyl maleinimides to accessenantiomericallypure 3-substituted succinimides catalyzed by Rh/bisphosphine-thiourea (ZhaoPhos). This efficient catalytic system furnished the desired 3-substituted succinimide products with high yields and enantioselectivities (up to 99% yield, full conversions, almost all