تفاعل #75914

معادلة التفاعل

6-methoxy-2-methylindanone

benzene

iodine

benzene

ethyl bromoacetate

→

ethyl-(1-hydroxy-2-methyl-6-methoxy-indenyl) acetate

المذيبات

ethanol

acetic acid

ether

acetic acid

ظروف التفاعل

المعالجة

1. 1
   أخرىthe reaction
2. 2
   درجة الحرارةthe reaction mixture is maintained
3. 3
   درجة الحرارةat reflux temperature (ca. 65°) with external heating
4. 4
   workup.WAITAt three-hour intervals, two batches of 10 g
5. 5
   درجة الحرارةthe mixture is then refluxed for 8 hours
6. 6
   workup.ADDITIONAfter addition of 30 ml
7. 7
   أخرىThe organic layer is separated
8. 8
   استخلاصthe aqueous layer is extracted twice with ether
9. 9
   غسيلThe combined organic layers are washed thoroughly with water, ammonium hydroxide and water
10. 10
    تجفيفDrying over sodium sulfate, evaporation of solvent in vacuo
11. 11
    أخرىby pumping at 80°

الإجراء التجريبي

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.).

المصدر