Ambient synthesis of spiro[4H-pyran-oxindole] derivatives under [BMIm]BF4 catalysis
摘要:
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.
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.