Vinylogous formamides-5-formyluracils and 4-formylpyrazoles-undergo smooth olefination in THF in the presence of indium metal (0.8 equiv) and BF3.OEt2 (1 equiv) and allyl bromide (1 equiv) to provide the respective diene-substituted heterocycles in a single step. (C) 2004 Elsevier Ltd. All rights reserved.
Bhuyan, Pulak J.; Lekhok, Kushal C.; Sandhu, Jagir S., Journal of Chemical Research, Miniprint, 1998, # 9, p. 2025 - 2032
作者:Bhuyan, Pulak J.、Lekhok, Kushal C.、Sandhu, Jagir S.
DOI:——
日期:——
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.