Reacción #64174

Ecuación de reacción

phenylpropiolic acid

thionyl chloride

4-toluidine

→

N-(4-methylphenyl) phenylpropiolamide

Rendimiento 49.2%

Disolventes

benzene

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturaheated between 60°-70° C. for 3 hrs
2. 2
   Otrosolvent was evaporated
3. 3
   workup.ADDITIONThe reaction vessel was charged with 50 mL of fresh benzene
4. 4
   Temperaturathe mixture cooled in an ice bath
5. 5
   workup.ADDITIONAdded next, dropwise in 50 mL benzene
6. 6
   workup.ADDITIONAfter addition
7. 7
   Otrothe ice bath was removed
8. 8
   workup.STIRRINGthe mixture stirred at room temperature for one hour
9. 9
   workup.ADDITIONThe mixture was poured into 200 mL cold water
10. 10
    Otrothe layers were separated
11. 11
    ExtracciónThe aqueous layer was extracted with three 100 mL portions of ethyl acetate
12. 12
    LavadoThe combined organic layers were then washed sequentially with 100 mL portions of 5% aqueous hydrochloric acid, water, 5% aqueous sodium carbonate and water
13. 13
    OtroThe organic layer was dried
14. 14
    Filtraciónfiltered
15. 15
    Otrosolvent was evaporated from the filtrate
16. 16
    OtroThe resulting solid was recrystallized twice from ethanol/water

Procedimiento

A mixture of 14.61 g (0.10 mole) phenylpropiolic acid, 14.28 g (0.12 mole) thionyl chloride and 50 mL benzene was stirred and heated between 60°-70° C. for 3 hrs. The reaction was allowed to cool to room temperature and solvent was evaporated. The reaction vessel was charged with 50 mL of fresh benzene and the mixture cooled in an ice bath. Added next, dropwise in 50 mL benzene, was 21.43 g (0.20 mole) of 4-toluidine. After addition was complete, the ice bath was removed and the mixture stirred at room temperature for one hour. The mixture was poured into 200 mL cold water and the layers were separated. The aqueous layer was extracted with three 100 mL portions of ethyl acetate. The combined organic layers were then washed sequentially with 100 mL portions of 5% aqueous hydrochloric acid, water, 5% aqueous sodium carbonate and water. The organic layer was dried, filtered and solvent was evaporated from the filtrate. The resulting solid was recrystallized twice from ethanol/water to provide 11.58 g (49.20 mmol, 49%) N-(4-methylphenyl) phenylpropiolamide as a white powder, mp=139°-141°. NMR (CDCl3 /TMS): 2.35 (S, 3H), 7.1-7.6 (m, 10H). IR (Nujol):2214, 1636. High resolution mass spectrum: Calculated; 236. 107539. Measured; 236. 107101. Anal. calcd. for C16H13NO: C 81.70, H 5.53, N 5.96; Found C 3581.55, H 5.40, N 6.05.

Fuente