Triethylamine → HCID 16071020, compound

Participants

Reaction Steps

5-Bromo-6-methyl-1-(4-piperidinyl)-1,3-dihydro-2H-benzimidazol-2-one (D37) (1.16 mmol, 359 mg) was dissolved in dichloromethane (20 mL) and tetrahydropyran-4-one (8.12 mmol, 7 eq, 813 mg), sodium triacetoxyborohydride (8.12 mmol, 1.72 g, 7 eq) and triethylamine (3.48 mmol, 352 mg, 3 eq, 0.48 ml) added. The reaction mixture was stirred at room temperature for 20 h. The reaction mixture was diluted with dichloromethane, washed with aqueous NaOH (pH 12), and the product extracted with dichloromethane (×2). The combined organic layers were washed with aqueous NaOH (pH 12), dried (MgSO4) and the solvent removed under reduced pressure to afford the crude product. The product was purified by chromatography, eluting with 12+M, DCM/50% MeOH in DCM, 00%-50%, 8CVs), to afford 5-bromo-6-methyl-1-[1-(tetrahydro-2H-pyran-4-yl)-4-piperidinyl]-1,3-dihydro-2H-benzimidazol-2-one as a pale yellow solid (0.3 mmol, 111 mg, 26%). This was dissolved in dichloromethane (5 mL) and HCl (1M solution in ether) was added. The mixture was stirred at room temperature for 15 minutes. The solvents were removed under reduced pressure to afford the title compound as a white solid (0.02 mmol, 9 mg, 7%)

Provenance & Evidence