Trifluoroacetic acid → (2s)-2-Benzyloxycarbonylamino-3-(6-(4-(5,6,7,8-tetrahydro-[1,8]naphthyridin-2-yl)-piperidin-1-yl)-purin-9-yl)-propionic acid

Participants

Reaction Steps

219 mg of the compound of step d) were dissolved in 12 ml of dichloromethane and 2 ml trifluoroacetic acid were added under stirring at ambient temperature. After 6 hours the reaction was complete. The solvents were removed in vacuo. The residue was mixed with toluene and this mixture was again evaporated. The resulting resin was triturated with diethylether. After filtration 210 mg of a faint yellow solid were isolated. MS (ES+): m/e=557.2 (M+H)+.

Provenance & Evidence