Triethylamine → HCID 11502125, compound

Participants

Reaction Steps

A mixture of 2-(4-chloro-2-methylphenyl)benzoxazole-4-carboxylic acid (59 mg, 0.21 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (79 mg, 0.41 mmol), 1-hydroxybenzotriazole (55 mg, 0.41 mmol) and (S)-(−)-3-aminoquinuclidine dihydrochloride (51 mg, 0.26 mmol) in DMF (2 mL) was stirred at room temperature for 10 min, then triethylamine (0.11 mL, 0.82 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 (2×50 mL), dried (Na2SO4), filtered and concentrated. The crude material was purified by preparative TLC (silica gel, 90:9:1 dichloromethane/methanol/concentrated ammonium hydroxide) to afford (S)—N-(1-azabicyclo[2.2.2]oct-3-yl)-2-(4-chloro-2-methylphenyl)benzoxazole-4-carboxamide (16 mg, 19%) as a light yellow solid: 1H NMR (500 MHz, CDCl3) δ 9.47 (d, J=7.0 Hz, 1H), 8.29 (d, J=1.7 Hz, 1H), 8.20-8.10 (m, 2H), 7.83 (d, J=1.7 Hz, 1H), 7.06 (d, J=8.8 Hz, 2H), 4.45-4.35 (m, 1H), 3.93 (s, 3H), 3.55-3.45 (m, 1H), 3.15-3.00 (m, 2H), 2.95-2.90 (m, 2H), 2.85-2.75 (m, 1H), 2.20-2.15 (m, 1H), 2.10-2.00 (m, 1H), 1.80-1.75 (m, 2H), 1.70-1.55 (m, 1H); MS (ESI+) m/z 396 (M+H); HPLC 99.0% (AUC), tR=14.57 min.

Provenance & Evidence