Triethylamine → HCID 68455429, compound

Participants

Reaction Steps

A mixture of 2-(5-chlorothiophen-2-yl)benzoxazole-4-carboxylic acid (110 mg, 0.39 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (149 mg, 0.78 mmol), 1-hydroxybenzotriazole (106 mg, 0.78 mmol) and (S)-(−)-3-aminoquinuclidine dihydrochloride (135 mg, 0.49 mmol) in DMF (3 mL) was stirred at room temperature for 10 min, then triethylamine (0.22 mL, 1.4 mmol) was added. The resulting reaction mixture was stirred at room temperature overnight. The mixture was diluted with dichloromethane and then washed with a saturated solution of sodium bicarbonate. The aqueous layer was further extracted with dichloromethane (2×50 mL). The combined organic layers were washed with brine (50 mL), dried (Na2SO4), filtered and concentrated. The crude material was purified by column chromatography (silica gel, 90:9:1 dichloromethane/methanol/concentrated ammonium hydroxide) to afford (S)—N-(1-azabicyclo[2.2.2]oct-3-yl)-2-(5-chloro-thiophen-2-yl)benzoxazole-4-carboxamide (22 mg, 17%) as a white solid: 1H NMR (500 MHz, CDCl3) δ 9.41 (d, J=7.3 Hz, 1H), 8.17 (dd, J=7.8, 1.0 Hz, 1H), 7.73 (d, J=4.1 Hz, 1H), 7.69 (dd, J=8.2, 1.0 Hz, 1H), 7.48 (t, J=8.0 Hz, 1H), 7.06 (d, J=4.0 Hz, 1H), 4.50-4.45 (m, 1H), 3.65-3.60 (m, 1H), 3.30-3.20 (m, 2H), 3.15-3.05 (m, 2H), 3.02-2.95 (m, 1H), 2.30-2.55 (m, 2H), 1.95-1.78 (m, 3H); MS (ESI+) m/z 388 (M+H); HPLC>99% (AUC), tR=12.59 min.

Provenance & Evidence