Dichloromethane → Hydrochloric Acid

Participants

Reaction Steps

4-[4-(1-Methyl-1H-tetrazol-5-yl)-phenylamino]-piperidine-1-carboxylic acid tert-butyl ester (401 mg; 1.12 mmol, prepared in accordance with Example 19) is dissolved in dichloromethane (3 mL) and trifluoroacetic acid (1 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 stiffing. The solid formed is filtered and is dried under high vacuum to afford the desired product as hydrochloride (257 mg; 0.87 mmol).

Provenance & Evidence