Sulfuric Acid → 2-bromo-5-methyl-7H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one

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Reaction Steps

To concentrated sulfuric acid (10 ml) heated to 60° C. was added the compound (1.3 g) obtained in Step 2 in divided portions, and the mixture was stirred at the same temperature for 3 hr. The reaction mixture was poured into ice (100 g), and the mixture was neutralized with an aqueous solution (100 ml) of sodium carbonate (20 g). The organic layer was extracted with chloroform (50 ml), and dried to give the title compound (810 mg).

Provenance & Evidence