Asymmetric organocatalytic decarboxylative Mannich reaction using β-keto acids: A new protocol for the synthesis of chiral β-amino ketones
作者:Chunhui Jiang、Fangrui Zhong、Yixin Lu
DOI:10.3762/bjoc.8.144
日期:——
The first decarboxylativeMannichreaction employing beta-keto acids, catalyzed by cinchonine-derived bifunctional thiourea catalyst has been described. The desired beta-amino ketones were obtained in excellent yields and with moderate to good enantioselectivities.
A palladium-catalyzed asymmetric [3 + 2] annulation reaction between racemic 5-vinyloxazolidinones and N-sulfonyl imines was established. Under the influence of the palladium complex with a chiral ammonium-phosphine hybrid ligand, the cycloaddition proceeded smoothly to yield imidazolidines bearing alpha-amino quaternary stereocenters in high yields with excellent diastereo- and enantioselectivities.