反应详情

To dry magnesium turnings (0.25 g, 10 mmol) under an argon atmosphere was added a solution of 4-bromo-1,2-methylenedioxybenzene (2.1 g, 10 mmol) in 1:10 THF/Et2O (22 ml). The resulting solution was allowed to stir at room temperature for 2 h. During this time, additional THF (4 ml) was added. The resulting 3,4-methylenedioxyphenylmagnesium bromide was added to a solution of ethyl 3-(3,4-methylenedioxyphenyl)-1-oxoindene-2-carboxylate (0.50 g, 2 mmol) in 1:4 THF/Et2O (25 ml) under an argon atmosphere at 0° C. The resulting mixture was stirred at 0° C. for 15 min, at which time 1M HCl (50 ml) was added. The phases were separated and the aqueous phase was extracted with Et2O. The combined organic extracts were washed with saturated aqueous NaCl and dried (MgSO4). The solvent was removed in vacuo, and the residue was purified by flash chromatography, eluting with 10% EtOAc/hexanes to afford the title compound as a yellow solid (0.29 g, 42%).

1. additionwas added
2. customThe phases were separated
3. extractionthe aqueous phase was extracted with Et2O
4. washThe combined organic extracts were washed with saturated aqueous NaCl
5. dry with materialdried (MgSO4)
6. customThe solvent was removed in vacuo
7. customthe residue was purified by flash chromatography
8. washeluting with 10% EtOAc/hexanes