Synthesis of 2-Methyl-9-oxo-9<i>H</i>-furo[2,3-<i>c</i>]benzopyrans and 2-Methyl-3<i>H</i>,4<i>H</i>[1]benzopyrano[3,4-<i>b</i>]pyrrol-4-ones
作者:Raghu Ram、S. Krupadanam、G. Srimannarayana
DOI:10.1080/00397919808004294
日期:1998.7
A one-pot [Bmim]OH-mediated synthesis of 3-benzamidocoumarins
作者:Lal Dhar S. Yadav、Santosh Singh、Vijai K. Rai
DOI:10.1016/j.tetlet.2009.02.166
日期:2009.5
The first example of an ionic liquid-promoted one-pot synthesis of 3-benzamidocoumarins from salicylaldehydes and 2-pheny-1,3-oxazolan-5-one via Knoevenagel condensation-ring transformation cascades has been reported. No by-product formation, operational simplicity, ambient temperature and high yield (85-97%) are the salient features of the present synthetic protocol. After isolation of the product, the ionic liquid, [Bmim]OH can be easily recycled for further use without any loss of efficiency. (C) 2009 Elsevier Ltd. All rights reserved.