Benzylamine → N-Benzyl-(3-oxo-5H-thiazolo[2,3-b]quinazolin-2(3H)-ylidene)acetamide

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To a stirred mixture of (3-oxo-5H-thiazolo[2,3-b]quinazolin-2(3H)-ylidene)acetic acid (10.5 g, 1.9 mmols) and benzylamine (0.23 g, 2.1 mmols) in 25 ml dimethylformamide at 0° C., was added diethylphosphoryl cyanide (0.28 g, 2.1 mmols) (in dimethylformamide solution), followed by triethylamine (0.41 g, 4.0 mmols). The reaction mixture was stirred for 4 hours at 0° C. and then, at room temperature overnight. The reaction mixture was diluted with benzene-ethyl acetate and washed sequentially with 5% hydrochloric acid, water, saturated aqueous sodium bicarbonate and saturated aqueous sodium chloride. The organic solution was dried over anhydrous magnesium sulfate, and evaporated to dryness under reduced pressure to give N-Benzyl-(3-oxo-5H-thiazolo[2,3-b]quinazolin-2(3H)-ylidene)acetamide which was recrystallized from ethyl acetate. Yield--0.09 g. Mp 258°-259° C.

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