反应详情

A solution of 20 g (0.12 mole) of 3-chloro-6-nitroaniline in 350 ml of methanol was hydrogenated over 5% palladium on carbon to yield 24.9 g of the corresponding diamino compound. Reaction of the diamino compound with potassium ethylxanthate using the method described in Example 10 yielded 19 g of 5-chloro-2-mercaptobenzimidazole, as confirmed by elemental analysis. The title compound (1.14 g) was prepared by the method of Example 6 using 8-hydroxymethylimidazo[1,2-a]pyridine as the hydrochloride salt (701 mg, 3.8 mmole) and using 701 mg (3.8 mmole) of 5-chloro-2-mercaptobenzimidazole instead of 2-mercapto-5-methoxybenzimidazole. Structure assignment was supported by the nmr and infrared spectra.