作者:Lei Zhang、Myoung-Mo Lee、Soo-Mi Lee、Jihye Lee、Maosheng Cheng、Byeong-Seon Jeong、Hyeung-geun Park、Sang-sup Jew
DOI:10.1002/adsc.200900787
日期:2009.12
e with C(9S)-aminodihydroquinine or C(9R)-aminodihydroquinidine and successively applied to the Michael addition of dimethyl malonate to nitroolefins as very efficient chiral Lewis acid bifunctionalorganocatalysts (up to >99% ee).
chemical modification of a chiraldiamineligand may produce a robust and recyclable enantioselective catalyst. Metallopolymers based on chiral cyclohexyldiamine‐containing ditopic ligands and nickel(II) complexes have been readily prepared and applied in catalytic enantioselectiveMichaeladditions of 1,3‐dicarbonyl compounds to nitroalkenes. High yields and good enantioselectivities have been obtained and
An enantioselective Michael addition of malonate to nitroalkenes catalyzed by low loading demethylquinine salts in water
作者:Fu-Xin Chen、Cheng Shao、Quan Wang、Pin Gong、Dong-Yan Zhang、Bang-Zhi Zhang、Rui Wang
DOI:10.1016/j.tetlet.2007.09.168
日期:2007.11
An enantioselective Michaeladdition of malonate to nitroalkenes is efficiently catalyzed by low loading demethylquinine salts in water; the yield range from 49% to 93% and the ee up to 90%.
Enantioselective organocatalytic Michael addition of malonate esters to nitro olefins using bifunctional cinchonine derivatives
作者:Jinxing Ye、Darren J. Dixon、Peter S. Hynes
DOI:10.1039/b508833j
日期:——
and evaluated for asymmetric organocatalytic activity in the dimethyl malonate Michaeladdition to beta-nitrostyrene; thiourea derivative was identified as the most effective bifunctional organic catalyst and found to induce high enantioselectivity in the malonate ester Michaeladdition reaction to a range of nitroolefins.
Novel bifunctional chiral thiourea-tertiary amines bearing a calix[4]arene scaffold were synthesized and applied in catalytic asymmetric Michael addition of acetyl acetone and dimethyl malonate to nitroolefins. The corresponding adducts were obtained in excellent yields (up to 99%) and with high enantioselectivities (up to 94% ee). (C) 2016 Elsevier Ltd. All rights reserved.