Hydrochloric Acid → 4-(2-(5-((Tert-butoxycarbonylamino)methyl)pyridin-2-ylamino)thiazol-5-ylthio)-3-fluoropicolinic acid

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Reaction Steps

A solution of methyl 4-(2-(5-((tert-butoxycarbonylamino)methyl)pyridin-2-ylamino)thiazol-5-ylthio)-3-fluoropicolinate (1.28 g, 2.60 mmol) in tetrahydrofuran (40 mL) was treated with sodium hydroxide (5N, 3.12 mL, 15.6 mmol) at 23° C. The reaction was stirred for 2 hours, then acidified with conc. HCl to pH ˜2.0. Water was then added and the aqueous phase was extracted with ethyl acetate/THF. The combined organic layers were dried over anhydrous magnesium sulfate, filtered and concentrated to give the title material (1.08 g, 87%) as a solid which was used as such in the next reaction.

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