Tetrahydrofuran → 6-bromo-5-methyl-3-phenyl-3,4-dihydro-2H-benzo[e][1,3]oxazin-2-one

A solution of 3-bromo-6-hydroxy-2-methyl-N-phenylbenzamide (Intermediate 16-1, 50 mg, 0.163 mmol) in THF (2 mL) was treated at rt with lithium aluminum hydride (50 mg, 1.317 mmol) and the mixture was heated at reflux for 2 h. It was then cooled to rt and carefully treated with saturated aqueous ammonium chloride (2 mL). The mixture was diluted with DCM (60 mL) and washed with water (5 mL) and brine (5 mL), dried and concentrated to give the 4-bromo-3-methyl-2-((phenylamino)methyl)phenol (45 mg). Without purification, this material was dissolved in DCM (3 lM) and treated with carbonyldiimidazole (30.5 mg, 0.188 mmol) and DMAP (2.091 mg, 0.017 mmol) at rt and the mixture was stirred for 1 h. The mixture was diluted with DCM (60 mL) and washed with NaHCO3 (aq) (5 mL) and brine (5 mL), dried and concentrated. The residue was purified by column chromatography (eluting with a gradient from 95:5 to 50:50 hexane-EtOAc) to give 6-bromo-5-methyl-3-phenyl-3,4-dihydro-2H-benzo[e][1,3]oxazin-2-one (25 mg). 1H NMR (400 MHz, chloroform-d) δ 7.33-7.57 (6H, m), 6.88 (1H, d, J=8.88 Hz), 4.82 (2H, s), 2.30 (3H, s). Mass spectrum m/z 318, 320 (M+H)+.

1. temperaturethe mixture was heated
2. temperatureat reflux for 2 h
3. washwashed with water (5 mL) and brine (5 mL)
4. customdried
5. concentrationconcentrated

ORD 기록

ord-ddfa9079626a4265804fad9fb4c3c8b4

출처 데이터셋

uspto-grants-2011_12

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US08084620B2