Phosphorus oxychloride → 4-oxo-2-phenyl-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-7-carbonitrile

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Reaction Steps

From 3.2 g (0.01 mol) of 4-oxo-2-phenyl-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-7-carboxamide (Example 25), 90 ml of phosphorus oxychloride and 50 ml of chloroform and refluxing for twenty-four hours, following the procedure of Example 27, there is obtained 2.5 g of 4-oxo-2-phenyl-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-7-carbonitrile; mp 349°-351° C. after recrystallization from pyridine.

Provenance & Evidence