作者:Jairo Quiroga、Henry Insuasty、Braulio Insuasty、Rodrigo Abonı́a、Justo Cobo、Adolfo Sánchez、Manuel Nogueras
DOI:10.1016/s0040-4020(02)00433-7
日期:2002.6
Pyrido[2,3-d]pyrimidines have been synthesized via a selective cyclocondensation reaction between 6-aminopyrimidines 1 and the Mannich bases, propiophenone hydrochlorides 2. Intermediates for this reaction, such as the Michael addition adduct and the further hydrated pyrido[2,3-d]pyrimidine were isolated to prove the postulated mechanism. NMR analysis of bidimensional experiments allowed to determine unambiguously the process to obtain 7-arylpyrido[2,3-d]pyrimidines. (C) 2002 Elsevier Science Ltd. All rights reserved.