Pyridine → Phenyl 5-ethyl-1,3,4-thiadiazol-2-ylcarbamate

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A solution of 5-Ethyl-[1,3,4]thiadiazol-2-ylamine (2.5 g, 19.4 mmol) and pyridine (1.72 ml, 21.3 mmol) in dichloromethane (70 ml) is cooled to −70° C. and treated with a solution of phenylchloroformate (2.45 ml, 19.6 mmol) in dichloromethane (10 ml) dropwise. The reaction mixture is allowed to warm to ambient temperature and stirred for 3 hours during which a precipitate forms. The precipitate is collected by filtration, and dried under vacuum to afford (5-Ethyl-[1,3,4]thiadiazol-2-yl)-carbamic acid phenyl ester as white solid. [M+H] 250.15

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