反应详情

Bromine (0.8 mL, 15.7 mmol) was added to a solution of 5-oxo-5,6,7,8-tetrahydro-naphthalene-2-carbonitrile (2.7 g, 15.7 mmol), prepared in the previous step, in dry methylene chloride (55 mL) at 0° C. The reaction was warmed to room temperature. After 2 h, the reaction was diluted with methylene chloride and washed with 5% sodium thiosulfate and brine. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to give 4.3 g of crude product. Purification of the crude product on silica gel using 10% ethyl acetate:hexane as the eluent gave 6-bromo-5-oxo-5,6,7,8-tetrahydronaphthalene-2-carbonitrile (3.2 g, 81%), MS (ES) m/z 251 [M+H]+.

1. washwashed with 5% sodium thiosulfate and brine
2. dry with materialThe organic layer was dried over anhydrous sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. customto give 4.3 g of crude product
6. customPurification of the crude product on silica gel using 10% ethyl acetate