Triethylamine → HCID 59017509, compound

Participants

Reaction Steps

A mixture of 2-(3-chlorothiophen-2-yl)benzoxazole-4-carboxylic acid (59 mg, 0.21 mmol), 3-amino-9-methyl-9-azabicyclo[3.3.1]nonane dihydrochloride (57 mg, 0.25 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (80 mg, 0.42 mmol) and 1-hydroxybenzotriazole (57 mg, 0.42 mmol) in DMF (2 mL) was stirred at room temperature for 10 min, then triethylamine (0.15 mL, 1.05 mmol) was added. The resulting reaction mixture was stirred at room temperature overnight. The mixture was diluted with dichloromethane (30 mL), and then washed with a saturated solution of sodium bicarbonate. The aqueous layer was further extracted with dichloromethane (2×30 mL). The combined organics were dried (Na2SO4), filtered and concentrated. The crude material was purified by column chromatography (silica gel, 90:9:1 ethyl acetate/methanol/concentrated ammonium hydroxide) and semi-preparative HPLC to afford N-(9-methyl-9-azabicyclo[3.3.1]non-3-yl)-2-(3-chlorothiophen-2-yl)benzoxazole-4-carboxamide (45 mg, 51%) as a white solid: 1H NMR (500 MHz, CDCl3) δ 9.11 (d, J=7.0 Hz, 1H), 8.22 (dd, J=8.0, 1.0 Hz, 1H), 7.69 (dd, J=8.0, 1.0 Hz, 1H), 7.59 (d, J=5.5 Hz, 1H), 7.48 (t, J=8.0 Hz, 1H), 7.16 (d, J=5.5 Hz, 1H), 4.65-4.55 (m, 1H), 3.18-3.09 (m, 2H), 2.68-2.60 (m, 2H) 2.56 (s, 3H), 2.12-1.95 (m, 3H), 1.62-1.44 (m, 4H), 1.21-1.10 (m, 1H); MS (ESI+) m/z 416 (M+H); HPLC>99% (AUC), tR=12.97 min.

Provenance & Evidence