Methanol → 3-(2,3-Difluorophenyl)-3-fluoropyrrolidine

Beteiligte Stoffe

Reaktionsschritte

To a solution of 1-benzyl-3-(2,3-difluorophenyl)-3-fluoropyrrolidine (1.6 g, 5.5 mmol) in dry 1,2-dichloroethane (10 mL) under nitrogen was added 1-chloroethylchloroformate (600 μl, 5.5 mmol). The mixture was stirred at ambient temperature for 7 h after which methanol was added and the mixture was evaporated. Methanol (10 mL) was added and the mixture was heated at reflux for 4 h. The mixture was evaporated and purified by column chromatography on silica gel (ethyl acetate/methanol, 1:0 to 1:1) to give the title compound (214 mg). The amine was converted to the hydrochloric acid salt and recrystallized from ethanol/diethyl ether: M.p. 136° C.; MS m/z (relative intensity, 70 eV) 201 (M+, 35), 151 (bp), 158 (69), 138 (45), 133 (42).

Herkunft & Nachweise