Synthesis of 7-substituted 5-oxo-5H-thiazolo[3,2-α]pyrimidine-6-carboxylic acids, 2-substituted 4-oxo-4H-pyrido[1,2-α]pyrimidine-3-carboxylic acids, and 2,6-disubstituted 4-quinolones from Meldrum's acid derivatives

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