Hydrochloric Acid → Hydrochloric Acid

Participants

Reaction Steps

4-(5-Trifluoromethyl-pyridin-2-ylamino)-piperidine-1-carboxylic acid tert-butyl ester (460 mg; 1.33 mmol, prepared in accordance with Example 49) is dissolved in dichloromethane (6 mL) and trifluoroacetic acid (1 mL) is added under stirring. After 30 minutes reaction time, the solution is concentrated under reduced pressure and the residue obtained is co-evaporated with dichloromethane (5 mL). The product isolated is dissolved in dioxane (2 mL) and a 4N solution of hydrochloric acid in dioxane (3 mL) is added. The precipitate formed is filtered, rapidly rinsed with a small amount of dioxane and is dried under high vacuum to afford the desired product as hydrochloride (352 mg; 1.25 mmol).

Provenance & Evidence