Sodium Cyanide → Tert-butyl 1-(4-chlorophenyl)-2-cyanoethylcarbamate

Participants

Reaction Conditions

Reaction Steps

Sodium cyanide (105 mg, 2.14 mmol) was added to 2-(tert-butoxycarbonylamino)-2-(4-chlorophenyl)ethyl methanesulfonate (Intermediate 23) (300 mg, 0.86 mmol) in DMF (5 mL) at 20° C. The resulting suspension was stirred at 80° C. for 3 hours. The reaction mixture was evaporated to dryness and redissolved in water (10 mL), and washed sequentially with DCM 3× (10 mL). The organic layer was dried over MgSO4, filtered and evaporated to afford crude product. The crude product was purified by flash silica chromatography, elution gradient 0 to 25% EtOAc in isohexane. Pure fractions were evaporated to dryness to afford tert-butyl 1-(4-chlorophenyl)-2-cyanoethylcarbamate (209 mg, 87%) as a white solid. 1H NMR (399.9 MHz, DMSO-d6) δ1.38-1.42 (9H, s), 2.82-2.89 (2H, m), 4.89 (1H, d), 7.38-7.45 (4H, m), 7.76 (1H, d). m/z (ESI+) (M−H)−=279; HPLC tR=2.42 min.

Provenance & Evidence