Ethyl chloroformate → HCID 25221222, 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 with a solution of 1.0 N ethyl chloroformate in dichloromethane (0.3 mL, 0.3 mmol) dropwise 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 (48 mg, 49%). 1H NMR (400 MHz, METHANOL-D4) δ ppm 0.99 (s, 3H), 1.21 (t, J=7.03 Hz, 3H), 1.31-1.54 (m, 6H), 1.58-2.00 (m, 9H), 2.06-2.35 (m, 3H), 2.88-3.04 (m, 2H), 3.04-3.18 (m, 2H), 3.29-3.44 (m, 2H), 3.48-3.69 (m, 3H), 4.08 (q, J=7.03 Hz, 2H). MS (M+1): 393.2.

Provenance & Evidence