Phenyl isocyanate → N-phenyl-4-(((trans-2-phenylcyclopropyl)amino)methyl)piperidine-1-carboxamide

Participants

Reaction Steps

To the solution of 2,2,2-trifluoro-N-(trans-2-phenylcyclopropyl)-N-(piperidin-4-ylmethyl)acetamide (60 mg, 0.184 mmol) (Example 11b) in chloroform (2 mL) was added isocyanatobenzene (0.030 mL, 0.276 mmol) The reaction mixture was stirred at room temperature for 1 hr. The saturated solution of NH4Cl was added, and layers were separated. The organic layer was evaporated and the oil dissolved in ethanol (2 mL) and 0.5 mL of 1 M NaOH was added. The reaction mixture was stirred for 1 hour at room temperature and then it was evaporated. The oil was purified on preparative HPLC (5 to 70% AcCN: H2O gradient with 0.1% formic acid modifier). The fractions were collected. The combined fractions were neutralized with aq. NH4OH, concentrated and extracted with ethyl acetate. The organic layer was washed with brine, dried over MgSO4 and evaporated. N-phenyl-4-(((trans-2-phenylcyclopropyl)amino)methyl)piperidine-1-carboxamide (54 mg, 0.147 mmol, 80% yield) was isolated as yellow oil. 1H NMR (400 MHz, METHANOL-d4) δ 7.32-7.38 (m, 2H), 7.20-7.31 (m, 4H), 7.10-7.17 (m, 1H), 7.05-7.10 (m, 2H), 6.98-7.05 (m, 1H), 4.20 (d, J=12.63 Hz, 2H), 2.79-3.01 (m, 2H), 2.65 (d, J=6.57 Hz, 2H), 2.28-2.45 (m, 1H), 1.95 (ddd, J=3.16, 5.94, 9.35 Hz, 1H), 1.70-1.90 (m, 3H), 1.14-1.31 (m, 2H), 1.10 (dt, J=4.86, 9.47 Hz, 1H), 1.03 (dt, 1H); LC-MS Rt=0.56 min; MS (ESI): 350.3 [M+H]+.

Provenance & Evidence