Sodium Hydroxide → HCID 178483355, compound

Participants

Reaction Steps

To a stirred solution of 6-{trans-4-[3-(4-chlorophenyl)-propylamino]-cyclohexyl}-3H-benzoxazol-2-one (655 mg, 1.7 mmol) in MeOH (20 mL) and CH2Cl2 (25 mL) was added p-formaldehyde (0.70 mL of a 37 wt % solution in H2O, 8.5 mmol). The reaction mixture was warmed to dissolve compound the amine, and then stirred at room temperature for 15 minutes. NaBH(OAc)3 was added and stirring was continued for 12 hours. The reaction mixture was brought to pH 8 with solid NaOH, concentrated under reduced pressure, and purified by flash chromatography (silica, 95:4.5:0.5 CH2Cl2:MeOH:NH4OH). Formation of the HCl salt, followed by recrystallization (MeOH:Et2O) gave 6-(trans-4-{[3-(4-chlorophenyl)propyl]-methylamino}-cyclohexyl)-3H-benzoxazol-2-one (461 mg, 66%), as a white solid: mp 267-271° C.; IR (KBr): 2949, 1769, 1494, 1452 cm−1; 1H NMR (500 MHz, DMSO-d6): δ 11.50 (s, 1H), 10.39 (s, 1H), 7.37 (d, J=8 Hz, 2H), 7.30 (d, J=8 Hz, 2H), 7.16 (s, 1H), 7.00 (br s, 2H), 3.33-3.26 (m, 1H), 3.18-3.10 (m, 1H), 3.04-2.95 (m, 1H), 2.69 (d, J=5 Hz, 3H), 2.68-2.62 (m, 2H), 2.58-2.51 (m, 1H), 2.18-1.98 (m, 4H), 1.93-1.87 (m, 2H), 1.69-1.51 (m, 4H); HRMS-APCI (m/z): [M+H]+ calcd for C23H27ClN2O2, 399.1839; found, 399.1831; HPLC: method A, 6.35 minutes (98.6%); method B. 11.82 minutes (99.1%); Anal. Calcd for C23H27ClN2O2.HCl.0.25H2O: C, 62.80; H, 6.53; N, 6.37. Found: C, 62.94; H, 6.57; N, 6.21.

Provenance & Evidence