1,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride → 4-(1-(4-Cyclobutyl-5-(5-ethyl-1H-imidazol-2-yl)-2-methylbenzoyl)piperidin-4-yl)benzonitrile

Participants

Reaction Steps

To a round-bottom flask was added a solution of 4-cyclobutyl-5-(5-ethyl-1H-imidazol-2-yl)-2-methylbenzoic acid (compound 245.3, 153 mg, 0.480 mmol, 1.00 equiv, 90%) in N,N-dimethylformamide (5 mL). 4-(Piperidin-4-yl)benzonitrile hydrochloride (compound 1.5, 132 mg, 0.590 mmol, 1.10 equiv), EDC.HCl (204 mg, 1.01 mmol, 2.00 equiv, 95%) and 4-dimethylaminopyridine (131 mg, 1.02 mmol, 2.00 equiv, 95%) were added to the reaction. The resulting solution was stirred overnight at room temperature, then concentrated in vacuo. The residue was purified using silica gel column chromatography with ethyl acetate/petroleum ether (2:1) as eluent. The crude product (˜150 mg) was further purified by Prep-HPLC with the following conditions (1#-Pre-HPLC-001 (SHIMADZU)): Column, SunFire Prep C18, 19*150 mm 5 um; mobile phase, water with 0.05% TFA and CH3CN (28% CH3CN up to 43% in 7 min, up to 100% in 2 min, down to 28% in 2 min); Detector, Waters 2489 254&220 nm. The fractions containing pure compound were combined and lyophilized to yield 62 mg (29%) of the title compound as a white solid. m/z (ES+) 453 (M+H)+. 1H NMR (400 MHz, CD3OD) δ 7.75-7.67 (m, 2H), 7.49-7.34 (m, 5H), 4.89-4.80 (m, 1H), 3.75-3.72 (m, 1H), 3.64-3.59 (m, 1H), 3.27-3.23 (m, 1H), 3.05-2.90 (m, 2H), 2.83 (q, 2H), 2.40 and 2.30 (2 singlets, amide rotamers, ArCH3, 3H), 2.27-1.97 (m, 6H), 1.90-1.70 (m, 4H), 1.40 (t, 3H).

Provenance & Evidence