Hydrochloric Acid → Hydrochloric Acid

Participants

Reaction Steps

4-[4-(4-Fluoro-benzenesulfonyl)-phenylamino]-piperidine-1-carboxylic acid tert-butyl ester (640 mg; 1.47 mmol, prepared in accordance with Example 31) is dissolved in a 1 to 1 mixture of dichloromethane and trifluoroacetic acid (2 mL) and the resulting solution is stirred at room temperature until complete conversion is observed (about 90 minutes). After concentration under reduced pressure, the residue obtained is co-evaporated with dichloromethane (2×10 mL). The crude residue is then diluted in ethylacetate (2 mL) and a 4N solution of hydrochloric acid in dioxane (3 mL) is added under stiffing. The solid formed is filtered and dried under high vacuum to afford the desired product as hydrochloride (546 mg; 1.47 mmol).

Provenance & Evidence