Sodium hydride → 3-[2-(Pyridin-2-ylamino)thiazol-5-ylmethylsulfanyl]benzoic acid

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A mixture of 3-mercaptobenzoic acid (308 mg, 2 mmol) and sodium hydride (60% in oil, 160 mg, 4 mmol) was stirred at RT under argon for 10 min and then cooled to 0° C. and (5-chloromethyl-thiazol-2-yl)pyridin-2-yl-amine hydrochloride salt (262 mg, 1 mmol) was added. The resulting reaction mixture was stirred at 0° C. for 1 h and acidified with 1N potassium hydrogen sulfate solution to pH=4. The mixture was filtered and the collected solid was washed with water and dried in vacuo to provide compound 11A, 3-[2-(pyridin-2-ylamino)thiazol-5-ylmethylsulfanyl]benzoic acid, which was used directly for the next step.

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