Diethyl Ether → HCID 136065803, compound

Participants

Reaction Steps

To 7-methoxy-3-(4-propylphenyl)-4,5-dihydronaphtho[1,2-c]isoxazole (Preparation 9B, 0.35 g, 1.096 mmol) in dichloromethane (10 mL) was added boron tribromide (1.425 mL, 1.425 mmol) dropwise over a period of 3 min. at 0° C. Approximately 2 min. after the addition was complete a white solid separated out. The reaction mixture was allowed to come to room temperature over a period of 10 min. and then was stirred at room temperature for 30 min. Additional boron tribromide (2 mL) was added at room temperature and the contents were stirred at room temperature for 1.5 h. Additional boron tribromide (10 mL) was added at room temperature. The heterogeneous solution become homogenous and brown. The contents were stirred at room temperature for an additional 3 h, then cooled to 0° C. and quenched by the very slow addition of MeOH (˜5 mL). The reaction mixture was concentrated under reduced pressure and partitioned between dichloromethane (50 mL) and water (20 mL). The dichloromethane layer was dried over sodium sulfate and concentrated to yield a greenish solid. Trituration with dichloromethane (2 mL) and ether (10 mL) followed by sonication for 3 min. yielded an off-white solid which was collected by filtration and washed with ether (2×5 mL) to afford 3-(4-propylphenyl)-4,5-dihydronaphtho[1,2-c]isoxazol-7-ol (0.115 g). The compound had an HPLC retention time=3.80 min (condition C); LC/MS M+1=306. 1H NMR (400 MHz, MeOD) δ ppm 7.72 (dd, J=8.16, 1.38 Hz, 3H) 7.38 (d, J=8.28 Hz, 2H) 6.76-6.84 (m, 2H) 2.93-3.07 (m, 4H) 2.65-2.72 (m, 2H) 1.65-1.78 (m, 2H) 0.99 (t, 3H).

Provenance & Evidence