Tertiary amine effect: synthesis of some novel spirosubstituted pyrido[2,3-d]pyrimidines
作者:Biswajita Baruah、Pulak J. Bhuyan
DOI:10.1016/j.tetlet.2008.10.125
日期:2009.1
5-Formyl-6-tertiaryamino uracils 3 prepared from 6-chloro-5-formyl uracil derivative 1 react with barbituric acids 4 in the presence of base catalyst to afford a novel class of spirosubstituted pyrido[2,3-d]pyrimidines 5 via 1,6-electro-cyclisation in excellent yields.