Phenol → (3-oxo-5H-thiazolo[2,3-b]quinazolin-2(3H)-ylidene)acetic Acid Phenyl Ester

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A solution of 1.30 g (5 mmols) (3-oxo-5H-thiazolo[2,3-b]quinazolin-2(3H)-ylidene)acetic acid, 1.27 g (5 mmols) N,N-bis(2-oxo-3-oxazolidinyl)phosphorodiamidic chloride, 0.49 g (5.2 mmols) phenol, and 1.10 g (10 mmols) triethylamine, in 10 ml dichloromethane was stirred at room temperature, under nitrogen atmosphere for 18 hours. Then, 10 ml of water (made slightly basic with sodium bicarbonate) were added. The precipitate was filtered of and the filtrate was dried over anhydrous magnesium sulfate, and evaporated to dryness under reduced pressure. The residual orange-yellow solid was recrystallized from anhydrous ethanol. Yield--0.62 g. Mp 194°-195° C.

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