An unexpected result in the condensation of 2-amino-6-bromopyridine with ethyl 4-chloroacetoacetate: Four dihalo-substituted pyrido[1,2-a]pyrimidin-4-ones as reaction products

Pier Luigi Ferrarini,Claudio Mori,Filippo Mori,Giuseppe Saccomanni,Silvia Barontini,Marco Macchia,Pier Luigi Barili,Mahmoud Hamdan

JOURNAL OF HETEROCYCLIC CHEMISTRY（1999）

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摘要

We report here the condensation of 2-amino-6-bromopyridine with ethyl 4-chloroacetoacetate in polyphosphoric acid. In this reaction, a mixture of the four possible dihalo-4H-pyrido[1,2-a]pyrimidin-4-ones 1-4 was obtained.

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