New aspects on the selective synthesis of 7-arylpyrido[2,3-d]pyrimidines
摘要:
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.
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.