2-Bromopropane → trans-N-((1-Isopropylpiperidin-4-yl)methyl)-2-phenylcyclopropanamine

Participants

Reaction Conditions

Reaction Steps

To a solution of 2,2,2-trifluoro-N-(trans-2-phenylcyclopropyl)-N-(piperidin-4-ylmethyl)acetamide (200 mg, 0.613 mmol) in acetonitrile (10 mL) was added potassium carbonate (254 mg, 1.838 mmol) followed by 2-bromopropane (98 mg, 0.797 mmol). The reaction mixture was heated in a sealed tube at 80° C. for 4 hours. The reaction mixture was filtered and evaporated. The resulting oil was purified by preparatory HPLC (5 to 40% AcCN: H2O with 0.1% formic acid modifier). The fractions were collected. The solution was neutralized with 1 M NaOH, concentrated and extracted with ethyl acetate. The organic layer was separated, dried over MgSO4, filtered and evaporated. The oil was dissolved in 6 ml of EtOH and 3 ml of 1 M NaOH. The reaction mixture was stirred for 20 min, and then it was concentrated. The concentrated solution was then partitioned between 2 ml of water and 5 mL of EtOAc. The organic layer was separated and evaporated. The resulting oil was dissolved in 3 mL of acetonitrile. 0.5 mL of 4 M HCl in dioxane was added. 3 mL of diethylether was added and the formed solid product was filtered. trans-N-((1-Isopropylpiperidin-4-yl)methyl)-2-phenylcyclopropanamine (80 mg, 0.246 mmol, 40.1% yield) was isolated as white solid. 1H NMR (400 MHz, METHANOL-d4) δ 7.29-7.40 (m, 2H), 7.13-7.28 (m, 3H), 3.43-3.63 (m, 3H), 3.21 (d, J=6.57 Hz, 2H), 3.11 (t, 2H), 3.04 (dt, J=3.98, 7.71 Hz, 1H), 2.49-2.69 (m, 1H), 2.17 (d, J=12.63 Hz, 3H), 1.56-1.86 (m, 3H), 1.34-1.48 (m, 7H); LC-MS Rt=0.42 min; MS (ESI): 273.3 [M+H]+.

Provenance & Evidence