反应详情

A solution of N-(3-bromo-2-chlorophenyl)-2-(methylamino)benzamide (150 mg, 0.442 mmol) in THF (15 mL) cooled to 0° C. and treated with triphosgene (197 mg, 0.663 mmol). The mixture was stirred at room temperature for 1 h, then was cooled to 0° C. and treated with water until gas evolution ceased. The mixture was concentrated, and the residue was dissolved in EtOAc and washed sequentially with saturated aqueous NaHCO3, water and brine, dried and concentrated. The residue was purified by column chromatography on silica gel, eluting with EtOAc-hexanes (gradient from 0-50%), to provide (Z)-4-((3-bromo-2-chlorophenyl)imino)-1-methyl-1H-benzo[d][1,3]oxazin-2(4H)-one as a beige solid (130 mg, 81% yield). 1H NMR (400 MHz, chloroform-d) δ 8.33 (dd, J=7.8, 1.4 Hz, 1H), 7.72-7.61 (m, 1H), 7.41 (dd, J=7.9, 1.5 Hz, 1H), 7.36-7.28 (m, 1H), 7.16-7.08 (m, 2H), 7.07-7.01 (m, 1H), 3.55 (s, 3H).

1. temperaturewas cooled to 0° C.
2. concentrationThe mixture was concentrated
3. dissolutionthe residue was dissolved in EtOAc
4. washwashed sequentially with saturated aqueous NaHCO3, water and brine
5. customdried
6. concentrationconcentrated
7. customThe residue was purified by column chromatography on silica gel
8. washeluting with EtOAc-hexanes (gradient from 0-50%)