Potassium Carbonate → methyl 3-((1-oxo-8-(3-(2-oxo-2,3-dihydro-1H-benzo[d]imidazol-1-yl)propyl)-4-phenyl-2,8-diazaspiro[4.5]decan-2-yl)methyl)benzoate

Participants

Reaction Conditions

Reaction Steps

A mixture of methyl 3-((1-oxo-4-phenyl-2,8-diazaspiro[4.5]decan-2-yl)methyl)benzoate (500 mg, 1.206 mmol, 1 equiv), 1-(3-iodopropyl)-1,3-dihydro-2H-benzimidazol-2-one-one (364.4 mg, 1.206 mmol, 1 equiv), and potassium carbonate (500 mg, 3.62 mmol, 3 equiv) in N,N-dimethylformamide was stirred at 65° C. for 16 h. After cooling the reaction mixture, the crude mixture was partitioned between ethyl acetate and water. The organic layer was dried over MgSO4, filtered and concentrated in vacuo. The residue was purified using the Biotage flash chromatography system (SNAP 50 g cartridge, Rf=0.4, gradient—10% methanol in dichloromethane) to afford the title compound as a white solid (416 mg, 62%); 1H NMR (400 MHz, DMSO-d6): δ 0.99 (bs, 1H); 1.57-1.59 (m, 2H); 1.67-1.74 (m, 3H); 1.86 (bs, 1H); 2.22-2.39 (m, 4H); 2.73-2.76 (m, 2H); 3.25-3.27 (m, 1H); 3.59-3.62 (m, 1H); 3.76 (t, 2H, J=6.8 Hz); 3.86 (s, 3H); 4.55 (s, 2H); 6.94-6.95 (m, 3H); 7.09-7.11 (m, 3H); 7.20-7.24 (m, 3H); 7.51-7.58 (m, 2H); 7.88-7.90 (m, 2H); 10.77 (s, 1H); MS for C33H36N4O4 m/z 553.11 (M+H)+.

Provenance & Evidence