反应详情

A solution of 13.4 g of 6-methoxy-2-methylindanone and 21 g. of ethyl bromoacetate in 45 ml. benzene is added over a period of five minutes to 21 g. of zinc amalgam (prepared according to Org. Syn. Coll. Vol. 3) in 110 ml. benzene and 40 ml. dry ether. A few cyrstals of iodine are added to start the reaction, and the reaction mixture is maintained at reflux temperature (ca. 65°) with external heating. At three-hour intervals, two batches of 10 g. zinc amalgam and 10 g. bromoester are added and the mixture is then refluxed for 8 hours. After addition of 30 ml. of ethanol and 150 ml. of acetic acid, the mixture is poured into 700 ml. of 50% aqueous acetic acid. The organic layer is separated, and the aqueous layer is extracted twice with ether. The combined organic layers are washed thoroughly with water, ammonium hydroxide and water. Drying over sodium sulfate, evaporation of solvent in vacuo followed by pumping at 80° (bath temperature)(1-2 mm.) gives crude ethyl-(1-hydroxy-2-methyl-6-methoxy-indenyl) acetate (ca. 18 g.).

1. customthe reaction
2. temperaturethe reaction mixture is maintained
3. temperatureat reflux temperature (ca. 65°) with external heating
4. waitAt three-hour intervals, two batches of 10 g
5. temperaturethe mixture is then refluxed for 8 hours
6. additionAfter addition of 30 ml
7. customThe organic layer is separated
8. extractionthe aqueous layer is extracted twice with ether
9. washThe combined organic layers are washed thoroughly with water, ammonium hydroxide and water
10. dry with materialDrying over sodium sulfate, evaporation of solvent in vacuo
11. customby pumping at 80°