反应详情

温度

120 °C

A mixture of methyl 4-bromo-3-(2-methylallyloxy)benzoate (0.500 g, 1.754 mmol), tributyltin hydride (0.708 mL, 2.63 mmol), and AIBN (0.035 g, 0.210 mmol) in benzene (20 mL) was heated in a pressure tube at 120° C. for 22 h. The volatiles were removed under vacuum. The residue was diluted with ethyl acetate (100 mL) and shaken with 10% KF solution. The resulting precipitate was removed by suction filtration through CELITE®. The organic layer of the filtrate was separated, washed with saturated NaHCO3 solution and brine, and dried over anhydrous MgSO4. The desired product, methyl 3,3-dimethyl-2,3-dihydrobenzofuran-6-carboxylate (0.131 g, 0.635 mmol, 36.2% yield) was isolated as a colorless oil with ISCO (40 g silica gel, 1-10% ethyl acetate/hexane).

1. customThe volatiles were removed under vacuum
2. additionThe residue was diluted with ethyl acetate (100 mL)
3. customThe resulting precipitate was removed by suction filtration through CELITE®
4. customThe organic layer of the filtrate was separated
5. washwashed with saturated NaHCO3 solution and brine
6. dry with materialdried over anhydrous MgSO4