反应详情

A mixture of 12.0 g (44.0 mmol) of 2-hydroxy-3-bromo-5-(1,1-dimethylethyl)benzaldehyde oxime and 18.9 g (90.0 mmol) of trifluoroacetic anhydride in 100 ml of tetrahydrofuran was cooled in an ice-water bath. A solution of 15.2 g (150.0 mmol) of triethylamine in 40 ml of tetrahydrofuran was added. After refluxing overnight, the solvent was stripped. The residue was partitioned between water and methylene chloride. The organic phase was washed with 1N hydrochloric acid followed by saturated sodium bicarbonate, then dried and evaporated. The residue was crystallized from hexane to provide 10.4 g (41.2 mmol, 94%) of 2-hydroxy-3-bromo-5-(1,1-dimethylethyl)-benzonitrile; mp 69°-71° C.

1. temperaturewas cooled in an ice-water bath
2. temperatureAfter refluxing overnight
3. customThe residue was partitioned between water and methylene chloride
4. washThe organic phase was washed with 1N hydrochloric acid
5. customdried
6. customevaporated
7. customThe residue was crystallized from hexane