Pyridine → HCID 66801527, compound

Participants

Reaction Steps

A suspension of 2-fluoro-N-(3,5-difluoropyridin-4-yl)-6-nitrobenzimidoyl chloride (12.05 g, 36.4 mmol), thiourea (12.05 g, 159 mmol) and pyridine (16 mL, 200 mmol) in isopropanol (200 mL) under a nitrogen atmosphere was heated under reflux for 4 hours. Et3N (33.2 mL, 239 mmol) was added over 5 minutes and the reaction mixture was heated under reflux for 18 hours. After cooling to room temperature, the volatiles were removed under reduced pressure and the resultant residue was partitioned between water and EtOAc. The aqueous phase was further extracted with EtOAc (×5) and the combined organic layers were dried (Na2SO4) and concentrated to dryness. The resultant residue was purified by column chromatography on silica gel eluting with 0-50% EtOAc in cyclohexane to afford the title compound as a yellow solid (4.33 g, 41% yield). LCMS (Method D): RT=3.21 min, m/z: 294 [M+H+].

Provenance & Evidence