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Triamterene: Triamterene, 2,4,7-triamino-6-phenylpteridine (21.5.13), is synthesized in by the following scheme. Reacting guanidine with malonodinitrile gives 2,4,6-triaminopyrimi-dine (21.5.11). This undergoes nitrosation by reacting it with nitric acid, which results in the formation of 5-nitroso-2,4,6-triaminopyrimidine (21.5.12), which upon condensation with benzyl cyanide in the presence of sodium methoxide cyclizes into triamterene (21.5.13) [73-76].


2. CH3ONa

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