Reaktion #63993

Reaktionsgleichung

diisopropylamine

hydrochloric acid

n-heptanoic acid

methyl iodide

n-butyl lithium

→

2-methylheptanoic acid

Lösungsmittel

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeTo a cold (0° C.) solution of 100 ml
2. 2
   TemperaturThe resulting solution was cooled to 0° C.
3. 3
   workup.STIRRINGThe reaction was stirred at room temperature under nitrogen for 1.5 hours
4. 4
   Extraktionextracted with diethyl ether (3×100 ml.)
5. 5
   Waschenwashed with 10% hydrochloric acid, water, 20% sodium bisulfite
6. 6
   Trocknena brine solution and dried over magnesium sulfate
7. 7
   SonstigeThe solvent was removed in vacuo
8. 8
   workup.DISSOLUTION, dissolved in methanol containing 5.1 g
9. 9
   workup.STIRRINGAfter stirring overnight the mehtanol
10. 10
    Sonstigewas removed
11. 11
    workup.DISSOLUTIONthe residue dissolved in 150 ml
12. 12
    WaschenThe aqueous layer was washed with ether (2×100 ml.)
13. 13
    ExtraktionThe product was extracted with ether
14. 14
    Waschenwashed with a 20% sodium bisulfite solution and brine
15. 15
    Trocknendried over magnesium sulfate
16. 16
    SonstigeRemoval of the ether
17. 17
    Sonstigegave 5.0 g

Vorschrift

To a cold (0° C.) solution of 100 ml. of dry tetrahydrofuran containing 11.8 ml. of dry diisopropylamine and 55 ml. of 1.6M n-butyl lithium was added 5.4 ml. of n-heptanoic acid and the mixture allow to stir at room temperature for one hour. The resulting solution was cooled to 0° C. and 7.2 ml. of methyl iodide was added. The reaction was stirred at room temperature under nitrogen for 1.5 hours, and was then poured into 10% hydrochloric acid and extracted with diethyl ether (3×100 ml.). The extracts were combined, washed with 10% hydrochloric acid, water, 20% sodium bisulfite and a brine solution and dried over magnesium sulfate. The solvent was removed in vacuo and the residue, 5.61 g., dissolved in methanol containing 5.1 g. of potassium hydroxide. After stirring overnight the mehtanol was removed and the residue dissolved in 150 ml. of water. The aqueous layer was washed with ether (2×100 ml.) and acidified with 10% hydrochloric acid. The product was extracted with ether, washed with a 20% sodium bisulfite solution and brine and dried over magnesium sulfate. Removal of the ether gave 5.0 g. of the product as a yellow liquid.

Quelle