Thionyl Chloride → 2,6-dichloro-N-(3,5-difluoropyridin-4-yl)-4-iodobenzimidoyl chloride
Reaction equation
[Cl:1][C:2]1[CH:18]=[C:17]([I:19])[CH:16]=[C:15]([Cl:20])[C:3]=1[C:4]([NH:6][C:7]1[C:12]([F:13])=[CH:11][N:10]=[CH:9][C:8]=1[F:14])=O.S(Cl)([Cl:23])=O>>[Cl:1][C:2]1[CH:18]=[C:17]([I:19])[CH:16]=[C:15]([Cl:20])[C:3]=1[C:4]([Cl:23])=[N:6][C:7]1[C:12]([F:13])=[CH:11][N:10]=[CH:9][C:8]=1[F:14]Participants
3
Procedure
A mixture of 2,6-dichloro-N-(3,5-difluoropyridin-4-yl)-4-iodobenzamide (21.3 g, 49.7 mmol) in thionyl chloride (118 mL) was heated under reflux for 20 hours under a nitrogen atmosphere. After cooling to room temperature, the volatiles were removed under reduced pressure and the resultant residue was azeotroped with toluene (×3) and dried under vacuum to afford the title compound as a brown solid (22.4 g, quantitative). LCMS (Method E): RT=4.69 min, m/z: 448 [M+H+].
Workup
- temperaturewas heated
- temperatureunder reflux for 20 hours under a nitrogen atmosphere