Isopropyl chloroformate → HCID 25221223, compound

Participants

Reaction Steps

A solution of (3aR,7aR)-1-[1-(4-methyl-4-piperidyl)-4-piperidyl]-3a,4,5,6,7,7a-hexahydro-3H-benzoimidazol-2-one (HCl salt, 99 mg, 0.25 mmol) and diisopropylethylamine (129.3 mg, 1.0 mmol) in dry dichloromethane (5 mL) at 0° C. was added dropwise with a solution of 1.0 N isopropyl chloroformate in dichloromethane (0.3 mL, 0.3 mmol) and was stirred at room temperature for 3 h. Saturated NaHCO3 (5 mL) was added followed by dichloromethane (20 mL). The phases were separated and the aqueous phase was extracted with dichloromethane (2×10 mL). The combined organic phases were washed with brine, dried over Na2SO4 and concentrated in vacuo. The residue was purified with preparative LC/MS (high pH) to give the title compound (52 mg, 51%). 1H NMR (400 MHz, METHANOL-D4) δ ppm 0.98 (s, 3H), 1.21 (d, J=6.25 Hz, 6H), 1.30-1.51 (m, 6H), 1.61 (d, J=11.33 Hz, 1H), 1.67-1.89 (m, 7H), 1.95 (d, J=7.42 Hz, 1H), 2.13-2.34 (m, 3H), 2.85-3.16 (m, 4H), 3.28-3.41 (m, 2H), 3.47-3.68 (m, 3H), 4.77-4.85 (m, 1H). MS (M+1): 407.3.

Provenance & Evidence