Trifluoroacetic acid → Hydrochloric Acid

Participants

Reaction Steps

4-(4-Chloro-3-trifluoromethylsulfanyl-phenylamino)-piperidine-1-carboxylic acid tert-butyl ester (580 mg; 1.41 mmol, prepared in accordance with Example 15) is dissolved in dichloromethane (8 mL) and trifluoroacetic acid (2 mL) is slowly added under stirring. After 60 minutes reaction time, the mixture is concentrated under reduced pressure and co-evaporated twice with dichloromethane (10 mL). The crude residue is then diluted in dioxane (2 mL) and a 4N solution of hydrochloric acid in dioxane (3 mL) is added under stirring. A solid is formed which is then filtered and dried under high vacuum to afford the desired product as hydrochloride (484 mg; 1.40 mmol).

Provenance & Evidence