反应详情

A solution of 6-bromo-4,4-dimethyl-chroman-2-one (1 g, 3.92 mmol) in anhydrous tetrahydrofuran (20 mL) was treated with 3M solution of ethyl magnesium bromide (2.6 mL) and stirred at ambient temperature for 2 hours. The reaction mixture was poured into cold dilute hydrochloric acid and extracted with ethyl acetate (×2). The combined organic extract was dried over anhydrous sodium sulfate, filtered and evaporated in vacuo to afford a residue which was subjected to flash column chromatography over silica gel (230-400 mesh) using 10% ethyl acetate in hexane as the eluent to afford the title compound as a pale yellow solid (1.1 g, 100%).

1. extractionextracted with ethyl acetate (×2)
2. extractionThe combined organic extract
3. dry with materialwas dried over anhydrous sodium sulfate
4. filtrationfiltered
5. customevaporated in vacuo
6. customto afford a residue which