Potassium Carbonate → Tert-butyl 2-(4-(((trans-2-phenylcyclopropyl)amino)methyl)piperidin-1-yl)acetate

Participants

Reaction Conditions

Reaction Steps

To the solution of 2,2,2-trifluoro-N-(trans-2-phenylcyclopropyl)-N-(piperidin-4-ylmethyl)acetamide (200 mg, 0.613 mmol, Example 11b) in acetonitrile (5 mL) was added potassium carbonate (254 mg, 1.838 mmol) followed by tert-butyl 2-bromoacetate (155 mg, 0.797 mmol). The reaction mixture was stirred at 80° C. for 4 hours. The suspension was filtered and evaporated. The oil was suspended in 2 mL of dioxane and 2 mL of 1 M NaOH. The solution was stirred for 1 hour, then injected on preparatory HPLC (5 to 30% AcCN: H2O with 0.1% formic acid modifier). The fractions were collected. The combined fractions were neutralized with NH4OH and extracted with ethyl acetate. The organic layer was separated, washed with brine, dried, filtered and evaporated till dryness. tert-butyl 2-(4-(((trans-2-phenylcyclopropyl)amino)methyl)piperidin-1-yl)acetate (55 mg, 0.152 mmol, 24.75% yield) was isolated as colorless oil. 1H NMR (400 MHz, METHANOL-d4) δ 7.20-7.31 (m, 2H), 7.09-7.17 (m, 1H), 6.99-7.09 (m, 2H), 3.12 (s, 2H), 2.91-3.03 (m, 2H), 2.62 (d, J=7.07 Hz, 2H), 2.28-2.36 (m, 1H), 2.11-2.23 (m, 2H), 1.92 (ddd, J=3.28, 5.87, 9.28 Hz, 1H), 1.68-1.83 (m, 2H), 1.52-1.63 (m, 1H), 1.44-1.52 (m, 9H), 1.31 (qd, J=3.92, 12.34 Hz, 2H), 1.08 (dt, J=4.86, 9.47 Hz, 1H), 1.02 (dt, J=5.59, 7.26 Hz, 1H); LC-MS Rt=0.58 min; MS (ESI): 345.3 [M+H]+.

Provenance & Evidence