Reacción #336436

Ecuación de reacción

3-amino-4-[N-(4-cyanophenyl)amino]pyridine

3-Amino-4-[N-(4-cyanophenyl)amino]pyridine

triethyl orthoacetate

→

title compound

1-(4-Cyanophenyl)-2-methylimidazo[4,5-c]pyridine

Disolventes

acetic anhydride

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturawas heated
2. 2
   Temperaturaunder reflux for 2 hours under nitrogen
3. 3
   Temperaturacooled
4. 4
   Concentraciónconcentrated under reduced pressure The brown residue
5. 5
   workup.DISSOLUTIONwas dissolved in 1M hydrochloric acid
6. 6
   Lavadowashed with ethyl acetate (200 ml)
7. 7
   Extracciónextracted with dichloromethane (3×200 ml)
8. 8
   LavadoThe combined extracts were washed with water
9. 9
   Secadodried (MgSO4)
10. 10
    Concentraciónconcentrated

Procedimiento

A mixture of 3-amino-4-[N-(4-cyanophenyl)amino]pyridine (see part (b)) (9.31 g, 44.3 mmol), triethyl orthoacetate (40 ml) and acetic anhydride (30 ml) was heated under reflux for 2 hours under nitrogen, cooled, then concentrated under reduced pressure The brown residue was dissolved in 1M hydrochloric acid and washed with ethyl acetate (200 ml). The aqueous layer was rendered basic with saturated aqueous ammonia and extracted with dichloromethane (3×200 ml). The combined extracts were washed with water, dried (MgSO4) and concentrated to give the title compound (6.5 g), as a brown solid.

Fuente