Trifluoroacetic acid → 4-Fluorobenzenesulfonic 2-[(piperidine-4-carbonyl)amino]-benzothiazol-6-yl ester

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Reaction Steps

A solution of 4-[6-(4-fluorobenzenesulfonyloxy)benzothiazol-2-ylcarbamoyl]-piperidine-1-carboxylic acid tert-butyl ester (intermediate 3) (100 mg, 0.187 mmol) and of TFA (0.5 ml) in dichloromethane (4.5 ml) is stirred at room temperature for 1 hour. The reaction medium is evaporated to dryness. The residue is taken up in a minimum amount of water, neutralized by addition of aqueous 10% Na2CO3 solution and extracted with ethyl acetate to give 55 mg of 4-fluorobenzenesulfonic 2-[(piperidine-4-carbonyl)amino]benzo-thiazol-6-yl ester (white solid).

Provenance & Evidence