Trifluoroacetic acid → t-Butyl 4-(4-{2-fluoro-4-[3-(4-fluorophenyl)acetylthioureido]phenoxy}pyridin-2-ylcarbamoyl)piperidine-1-carboxylate

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Reaction Steps

t-Butyl 4-(4-{2-fluoro-4-[3-(4-fluorophenyl)acetylthioureido]phenoxy}pyridin-2-ylcarbamoyl)piperidine-1-carboxylate (38.8 mg, 0.062 mmol) and trifluoroacetic acid (0.50 ml) gave a crude product of piperidine-4-carboxylic acid (4-{2-fluoro-4-[3-(4-fluorophenyl)acetylthioureido]phenoxy}pyridin-2-yl}amide (ESI-MS (m/z):526). The crude product, formalin (37% aqueous solution; 0.0231 ml), acetic acid (0.0142 ml) and sodium triacetoxyborohydride (26.3 mg) gave the titled compound (1.1 mg, 3.29%) as colorless powder.

Provenance & Evidence