Reaktion #6522

Reaktionsgleichung

2,2-dimethyl-3'-trifluoromethyl-propionanilide

n-BuLi

methyl iodide

→

2,2,2'-trimethyl-3'-trifluoromethyl-propionanilide

Ausbeute 80.0%

Lösungsmittel

tetrahydrofuran

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigedid not rise above 10° C.
2. 2
   Sonstige(about 20 min.) and it
3. 3
   SonstigeThe cooling bath was removed
4. 4
   workup.STIRRINGthe reaction mixture was stirred at room temperature for 2.5 hours
5. 5
   workup.STIRRINGIt was stirred at room temperature for 4 hours
6. 6
   Sonstigequenched with water
7. 7
   EinengenThe solution was concentrated in vacuo
8. 8
   workup.ADDITIONdiluted with water
9. 9
   ExtraktionIt was then extracted with ether
10. 10
    Waschenthe ethereal extracts were washed with water
11. 11
    ExtraktionThe ether extract
12. 12
    Trocknenwas dried with MgSO4
13. 13
    Einengenconcentrated
14. 14
    Sonstigeto give a light yellow creamy solid (6.2 g., 95%)
15. 15
    SonstigeThis was purified by crystallization from dichloromethane and petroleum ether mixture

Vorschrift

A solution of 2,2-dimethyl-3'-trifluoromethyl-propionanilide (6.1 g, 25 mmol) in 100 ml dry tetrahydrofuran was cooled to 0° C. under nitrogen atmosphere and a solution of n-BuLi (1.6M in hexane, 50 ml, 75 mmol) was added dropwise in such a rate that the internal temperature did not rise above 10° C. (about 20 min.) and it was stirred at that temperature for 10 more minutes during which time a grayish turbidity appeared. The cooling bath was removed and the reaction mixture was stirred at room temperature for 2.5 hours. It was cooled to about 5° C. again and a solution of methyl iodide (4.258 g, 30 mmol) in tetrahydrofuran (10 ml.) was slowly transferred via a canula. It was stirred at room temperature for 4 hours and then quenched with water. The solution was concentrated in vacuo and then diluted with water and acidified with dilute HCl. It was then extracted with ether, and the ethereal extracts were washed with water followed by brine. The ether extract was dried with MgSO4 and concentrated to give a light yellow creamy solid (6.2 g., 95%). This was purified by crystallization from dichloromethane and petroleum ether mixture to afford colorless needles of 2,2,2'-trimethyl-3'-trifluoromethyl-propionanilide (80-85%, m.p. 122.5° C.).

Quelle