Solvent-free cascade reaction: direct multicomponent assembling of 2-amino-4H-chromene scaffold from salicylaldehyde, malononitrile or cyanoacetate and nitroalkanes
作者:Michail N. Elinson、Alexey I. Ilovaisky、Valentina M. Merkulova、Pavel A. Belyakov、Alexander O. Chizhov、Gennady I. Nikishin
DOI:10.1016/j.tet.2010.04.024
日期:2010.6
The new type of solvent-free cascade reaction was found: the direct heating of the mixture of salicylaldehyde, malononitrile or cyanoacetate and nitroalkanes at 60 degrees C in the presence of catalytic amounts of KF or NaOAc results in the formation of 2-amino-4-(1-nitroalkyl)-4H-chromene-3-carbonitriles or methyl 2-amino-4-(1-nitroalkyl)-4H-chromene-3-carboxylates in 30-90% yields. Thus, the new simple and efficient solvent-free 'one-pot' way to substituted medicinally privileged 2-amino-4H-chromene scaffold was found directly from such simple and reasonable starting compounds as salicylaldehyde, malononitrile or cyanoacetate and nitroalkanes. (C) 2010 Elsevier Ltd. All rights reserved.