1,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride → 4-(1-(2,4-Dimethyl-5-(-3a,4,6,6a-tetrahydro-1H-furo[3,4-d]imidazol-2-yl)benzoyl)piperidin-4-yl)benzonitrile

Participants

Reaction Steps

Into around-bottom flask, was placed a solution of 2,4-dimethyl-5-(3a,4,6,6a-tetrahydro-1H-furo[3,4-c]imidazol-2-yl)benzoic acid (compound 466.5, 80.0 mg, 0.250 mmol, 1.00 equiv, 80%) in N,N-dimethylformamide (4 mL). 4-(Piperidin-4-yl)benzonitrile hydrochloride (compound 1.5, 82.0 mg, 0.350 mmol, 1.20 equiv), 4-dimethylaminopyridine (76.0 mg, 0.620 mmol, 2.00 equiv), and EDC.HCl (116 mg, 0.610 mmol, 2.00 equiv) were added and the resulting solution was stiffed overnight at room temperature. The mixture was diluted with ethyl acetate (30 mL) and washed with brine (3×15 mL), dried (Na2SO4), filtered and concentrated in vacuo. The crude product (50 mg) was purified by Prep-HPLC with the following conditions (1#-Pre-HPLC-001(SHIMADZU)): Column, Xbridge Prep C18, 5 um, 19*150 mm; mobile phase, water with 0.05% TFA and CH3CN (15% CH3CN up to 50% in 9 min, up to 100% in 1 min, down to 15% in 1 min); Detector, Waters 2489 254 nm & 220 nm. The fractions containing pure product were combined and lyophilized to obtain the title compound as a white solid (13 mg, 12%). m/z (ES+) 429 (M+H)+. 1H-NMR (300 MHz, CD3OD): δ 7.70 (d, 2H), 7.53-7.36 (m, 4H), 5.09 (s, 2H), 4.17 (d, J=10.8 Hz, 2H), 3.77 (d, J=10.5 Hz, 2H), 3.60-3.44 (m, 1H), ˜3.3 (m, partially overlapped with water, 1H), 3.10-2.92 (m, 2H), 2.48 (s, 3H), 2.45 and 2.35 (2 singlets, amide rotamers, Ar—CH3, 3H), 2.10-1.97 (m, 1H), 1.92-1.52 (m, 3H).

Provenance & Evidence