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Selective N1-Alkylation of 1,3-Dibenzoylquinazoline-2,4(1H,3H)-Dione with Benzyl Chloride

Author(s): Ozerov AA and Novikov MS

The reaction of 1,3-dibenzoylquinazoline-2,4(1H,3H)-dione with potassium carbonate in anhydrous DMF at room temperature leads to the formation of a potassium salt of 3-benzoylquinazoline-2,4(1H,3H)-dione, the alkylation of which in situ with benzyl chloride produces 1-benzyl-3-benzoylquinazoline-2,4(1H,3H)-dione. A one-pot method for the preparation of N1-monosubstituted derivatives of quinazoline-2,4(1H,3H)-dione was developed. The effect of an alkaline agent on the yield and ratio of the debenzoylation products was studied.

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