Trifluoroacetic acid → N-(6-Amino-7-nitro-2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl)-methanesulfonamide

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Reaction Steps

To a solution of N-[6-(2,4-dimethoxy-benzylamino)-7-nitro-2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl]-methanesulfonamide (725 mg, 1.56 mmol) in dichloromethane (4 ml) is added trifluoroacetic acid (0.5 ml) and the mixture is stirred at room temperature for 30 minutes. Then the solvent is removed by rotavapor evaporation to give an orange solid which is suspended in diethyl ether, filtered and the residue washed 3 times with diethyl ether and two times with ethyl acetate to give the title product as a pure orange solid, m.p. 326-335° C. (decomp.).

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