1-Aminopiperidine → HCID 11555526, compound

Participants

Reaction Steps

To a magnetically stirred suspension of 1-(4-chlorophenyl)-2-(2,4-dichlorophenyl)-5-methylsulfonyl-1H-imidazole-4-carboxylic acid (2.23 g, 5.01 mmol) in anhydrous CH3CN (50 ml) was successively added N,N-diisopropylethylamine (Hunig's base) (1.90 ml, 11.0 mmol), O-benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HBTU) (2.27 g, 5.99 mmol) and 1-aminopiperidine (0.65 ml, 6.03 mmol). After stirring for 16 h, the resulting mixture was concentrated in vacuo. The residue was dissolved in EtOAc, successively washed with aqueous NaHCO3 solution, water and brine, dried over Na2SO4, filtered and concentrated to give a crude solid. This solid was further purified by flash chromatography (silicagel, EtOAc) and triturated with methyl-tert-butyl ether to give 1-(4-chlorophenyl)-2-(2,4-dichlorophenyl)-5-methylsulfonyl-N-(piperidin-1-yl)-1H-imidazole-4-carboxamide in 84% yield, mp 181–185° C. (dec); 1H-NMR (600 MHz, DMSO-d6) δ 1.35–1.41 (m, 2H), 1.61–1.66 (m, 4H), 2.80–2.84 (m, 4H), 3.52 (s, 3H), 7.38 (d, J=8 Hz, 2H), 7.42 (dd, J=8 and 2 Hz, 1H), 7.46 (d, J=8 Hz, 2H), 7.57 (d, J=2 Hz, 1H), 7.62 (d, J=8 Hz, 1H), 9.40 (s, 1H); HRMS (C22H22Cl3N4O3S) [M+H]+: found m/z 527.0469, calcd 527.0478.

Provenance & Evidence