Maleic Anhydride → 2,4-Diamino-5-(7,8-dimethoxy-2H-1-benzopyran-5-ylmethyl)pyrimidine Maleate

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To 2,4-diamino-5-(7,8-dimethoxy-2H-1-benzopyran-5-ylmethyl)pyrimidine (3.90 g, 12.4 mmol) in 200 mL of boiling water was added a solution of maleic acid, prepared by dissolution of maleic anhydride (1.25 g, 12.7 mmol) in 50 mL of hot water. After cooling to 0° C., the crystalline salt was filtered, washed with cold water, and dried at 75° C. to give 5.07 g (94.9%) of the title compound. Anal. Calcd for C20H22N4O7 : C, 55.81; H, 5.15; N, 13.02. Found: C, 55.78; H, 5.18; N, 12.98.

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