Reaktion #81931

Reaktionsgleichung

chloromethylphenyl sulfide

isobutyric acid

n-butyllithium

sodium hydride

diisopropylamine

→

2,2-dimethyl-3-(thiophenyl)propionic acid

Ausbeute 21.6%

Lösungsmittel

diethyl ether

hexane

tetrahydrofuran

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter heating
2. 2
   Temperaturat reflux for 15 min
3. 3
   Temperaturthe solution was heated to 35° C. for 30 min
4. 4
   Temperaturcooled to 0° C.
5. 5
   workup.WAITAfter 30 min at 0° C.
6. 6
   workup.WAIT35° C. for 1 hour
7. 7
   Sonstigewas recooled to 0° C.
8. 8
   SonstigeThe water layer was separated
9. 9
   Extraktionextracted with diethyl ether
10. 10
    Sonstigedried
11. 11
    Einengenconcentrated
12. 12
    Sonstigeto afford 4.23 g of crude product
13. 13
    SonstigeRecrystallization from methylene chloride/hexane

Vorschrift

To a mixture of 1.23 g (41 mmol) of 80% sodium hydride in 50 mL of dry tetrahydrofuran was added 3.88 g (38.3 mmol) of diisopropylamine and then 3.3 g (37.5 mmol) of isobutyric acid. After heating at reflux for 15 min, and cooling to 0° C., 15 mL (37.5 mmol) of a 2.5M n-butyllithium in hexane solution was added over 10 min. After 15 min, the solution was heated to 35° C. for 30 min, cooled to 0° C. and 5.94 g (37.5 mmol) of chloromethylphenyl sulfide was added. After 30 min at 0° C. and 35° C. for 1 hour, the solution was recooled to 0° C., water added and then diethyl ether. The water layer was separated, acidified and extracted with diethyl ether, dried and concentrated to afford 4.23 g of crude product. Recrystallization from methylene chloride/hexane afforded 1.49 g of 2,2-dimethyl-3-(thiophenyl)propionic acid, m/e 211 (M+H).

Quelle