Reaction Steps
To a solution of 2,2,2-trifluoro-N-(trans-2-phenylcyclopropyl)-N-(piperidin-4-ylmethyl)acetamide (170 mg, 0.521 mmol) in chloroform (10 mL) was added triethylamine (0.145 mL, 1.042 mmol) followed by ethyl chloroformate (0.055 mL, 0.573 mmol). The reaction mixture was stirred for 1 hour at room temperature and then it was evaporated to dryness. The oil was partitioned between 3 mL of ethanol and 3 M of 1 M NaOH. After 1 hour, the reaction mixture was concentrated, and 10 mL of ethyl acetate followed by 4 mL of brine were added. The organic layer was separated, dried over MgSO4, filtered and evaporated. The resulting oil was dissolved in 5 mL of 10% AcCN:Et2O and 0.5 mL of 4 M HCl/dioxane was added. The suspension was stirred for 30 min, and then it was filtered. Ethyl 4-(((trans-2-phenylcyclopropyl)amino)methyl)piperidine-1-carboxylate (120 mg, 0.336 mmol, 64.6% yield) was isolated as white solid. 1H NMR (400 MHz, METHANOL-d4) δ 7.30-7.39 (m, 2H), 7.22-7.29 (m, 1H), 7.11-7.22 (m, 2H), 4.19 (dd, J=1.26, 13.64 Hz, 2H), 4.13 (q, J=7.16 Hz, 3H), 3.15 (d, J=7.07 Hz, 2H), 3.02 (dt, J=4.14, 7.64 Hz, 1H), 2.86 (d, J=3.28 Hz, 2H), 2.54 (ddd, J=3.66, 6.69, 10.36 Hz, 1H), 1.99 (ddd, J=4.04, 7.52, 11.18 Hz, 1H), 1.82 (d, J=12.13 Hz, 2H), 1.56 (ddd, J=4.29, 6.63, 10.55 Hz, 1H), 1.42 (q, J=6.82 Hz, 1H), 1.27 (t, J=7.07 Hz, 3H), 1.17-1.33 (m, 1H); LC-MS Rt=0.76 min; MS (ESI): 303.3 [M++H]+.
