Reaktion #510287

Reaktionsgleichung

N-butyllithium

2-methylthiazole

4-chlorobenzonitrile

→

(Z)-1-(4-chlorophenyl)-2-(thiazol-2-yl)ethenamine

Ausbeute 31.0%

Lösungsmittel

—

hexanes

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGwas stirred at −70° C. for 90 minutes
2. 2
   workup.ADDITIONafter the end of the addition
3. 3
   Temperaturto warm to room temperature
4. 4
   workup.STIRRINGunder stirring
5. 5
   EinengenThe crude was concentrated to dryness
6. 6
   workup.ADDITIONdiluted with ethyl acetate
7. 7
   Waschenthen washed with water
8. 8
   Trocknendried over magnesium sulphate
9. 9
   Einengenconcentrated
10. 10
    SonstigeThe crude product was purified by flash chromatography on silica gel eluting with 10 to 100% ethyl acetate in dichloromethane
11. 11
    SonstigeThe solvent was evaporated to dryness

Vorschrift

A 2.5M solution of N-butyllithium (8.00 mL, 20.00 mmol) in hexanes, was added dropwise to 2-methylthiazole (1.983 g, 20 mmol) dissolved in THF (35.00 mL) over a period of 5 minutes under argon at −70° C. The resulting pale yellow slurry was stirred at −70° C. for 2.5 hour. 4-chlorobenzonitrile (2.75 g, 20.00 mmol) in THF (35.00 mL) was added dropwise to the suspension, which was stirred at −70° C. for 90 minutes after the end of the addition. The reaction mixture was allowed to warm to room temperature under stirring and darkened. The crude was concentrated to dryness and diluted with ethyl acetate then washed with water, dried over magnesium sulphate and concentrated. The crude product was purified by flash chromatography on silica gel eluting with 10 to 100% ethyl acetate in dichloromethane. The solvent was evaporated to dryness to afford (Z)-1-(4-chlorophenyl)-2-(thiazol-2-yl)ethenamine (1.466 g, 31.0%) as a pale yellow solid.

Quelle