反应详情

Dissolved in 100 ml of chloroform was 9.3 g of 2-n-butyl-3-methoxy-5,6-methylenedioxyindene, followed by a dropwise addition of 15.4 g of phosphorus tribromide over 1 hour under ice cooling. After stirring the resultant mixture for further 4 hours, the reaction mixture was stirred for additional 4 hours at room temperature. The reaction mixture was washed with water, a 5% aqueous solution of sodium hydroxide and water successively, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (eluent: a 20:1 mixture of n-hexane and ether) to give 7.6 g of 2-n-butyl-3-bromo-5,6-methylenedioxyindene having a melting point of 63.0°-64.0° C. as crystals (yield: 68%).

1. washThe reaction mixture was washed with water
2. dry with materiala 5% aqueous solution of sodium hydroxide and water successively, dried over anhydrous magnesium sulfate
3. concentrationconcentrated under reduced pressure
4. customThe residue was purified by column chromatography on silica gel (eluent
5. additiona 20:1 mixture of n-hexane and ether)