A facile one-potsynthesis route to spirooxindole derivatives was developed by combining the three types of catalytic activities of lipase from porcine pancreas (PPL) in the presence of water, i.e., the Knoevengel condensation, Michael addition and cyclization. PPL showed excellent catalytic activity and have a good adaptability to different substrates in the reaction. All the reactions go smoothly
Ambient synthesis of spiro[4H-pyran-oxindole] derivatives under [BMIm]BF4 catalysis
作者:Kurosh Rad-Moghadam、Leila Youseftabar-Miri
DOI:10.1016/j.tet.2011.05.077
日期:2011.8
A simple and efficient one-pot approach for assembling some fused spiro[4H-pyran-oxindole] heterocycles by means of three-component reactions between isatins, malononitrile or ethyl cyano-acetate, and 1,3-dicarbonyl compounds is reported. The combinatorial syntheses were achieved for the first time without applying extra activation energy at ambient temperature while making use of [BMIm]BF4 as an ionic liquid catalyst. Good functional group tolerance and broad scope of usable substrates are other prominent features of the present methodology. (C) 2011 Elsevier Ltd. All rights reserved.