Pyridine → N4-[4-(tert-Butyl)-1,3-thiazol-2-yl]-2-(acetylamino)isonicotinamide

Participants

Reaction Conditions

Reaction Steps

2-(Acetylamino)isonicotinic acid (500 mg, 2.8 mmol) was added dropwise with thionyl chloride (15 ml, 68.5 mmol) at room temperature, warmed to 80° C. and stirred for 30 minutes. The reaction solution was returned to room temperature, concentrated under reduced pressure, and the residue was subjected to azeotropy with toluene to evaporate excessive thionyl chloride. The resulting yellow crystals was added to a mixed solution of pyridine (0.25 ml), dichloromethane (5 ml) and 4-(tert-butyl)-1,3-thiazol-2-amine (525 mg, 3.35 mmol) under ice cooling. The mixture was stirred at 0° C. for 30 minutes, then warmed to room temperature, and further stirred for 2 hours and 30 minutes. The reaction solution was added with water and extracted with chloroform. The organic layer was dried over magnesium sulfate and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (chloroform→chloroform:methanol=80:1→50:1) to obtain 545.8 mg (61%) of the title compound.

Provenance & Evidence