Enantioselective Synthesis of β-Amino Esters Bearing a Benzothiazole Moiety via a Mannich-Type Reaction Catalyzed by a Cinchona Alkaloid Derivative
作者:Liang Li、Bao-An Song、Pinaki S. Bhadury、Yu-Ping Zhang、De-Yu Hu、Song Yang
DOI:10.1002/ejoc.201100351
日期:2011.7.18
Novel β-amino esters bearing a bioactive benzothiazole moiety were obtained with high enantioselectivities (up to 95 % ee) through a Mannich-type reaction of different imines with malonate in the presence of a new chiral cinchona alkaloid thiourea catalyst. Imines derived from both aromatic and heterocyclic aldehydes were found useful in this conversion.
Squaramide-catalysed enantionselective Mannich reaction of imines bearing a heterocycle with malonates
作者:Hai-Xiao He、Da-Ming Du
DOI:10.1039/c3ra43260b
日期:——
An efficient enantioselective Mannich reaction of iminesbearing a heterocycle with malonates catalysed by a cinchona-based squaramide organocatalyst has been developed. This catalytic asymmetric reaction afforded the β-amino ester derivatives containing a heterocycle moiety in high yields (up to 99%) and excellent enantioselectivities (up to 98%) in most cases. The imines with an electron-withdrawing