Electrochemically induced chain transformation of salicylaldehydes and alkyl cyanoacetates into substituted 4H-chromenes
作者:Michail N. Elinson、Alexander S. Dorofeev、Sergey K. Feducovich、Sergey V. Gorbunov、Ruslan F. Nasybullin、Nikita O. Stepanov、Gennady I. Nikishin
DOI:10.1016/j.tetlet.2006.08.053
日期:2006.10
Electrolysis of salicylaldehydes and alkyl cyanoacetates in ethanol in an undivided cell in the presence of sodium bromide results in the formation of substituted alkyl 2-amino-4-(1-cyano-2-alkoxy-2-oxoethyl)-4H-chromene-3-carboxylates in 85-95% yields. (c) 2006 Elsevier Ltd. All rights reserved.
Potassium exchanged layered zirconium phosphate as catalyst in the preparation of 4H-chromenes
Substituted 4H-chromenes were easily prepared by reaction of salicylaldehydes and ethylcyanoacetate in solvent free conditions using potassium exchanged layered zirconium phosphate as catalyst. (c) 2005 Elsevier Ltd. All rights reserved.