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Methyl 2-amino-4-(2-methoxy-2-oxo-ethyl)thiazole-5-carboxylate (2a), prepared from dimethyl acetone-1,3-dicarboxylate (1), sulfuryl chloride and thiourea according to a known procedure, was transformed in two steps into (4H-pyrido(1,2-a)pyrimidin-3-yl)thiazole-5-carboxylates (6).

Transformations of dimethyl acetone-1,3-dicarboxylate. The synthesis of (4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl)thiazole-5-carboxylates