p-Toluenesulfonic acid → 5-chloro-3-methyl-3H-imidazo(4,5-b)pyridine

Participants

Reaction Steps

To a solution of 6-chloro-N2-methylpyridine-2,3-diamine (300 mg, 1.9 mmol) in HC(OMe)3 (10 mL) was added TsOH (10 mg) at 22° C. The mixture was stirred for 3 h under reflux until TLC (PE: EA=3:1) showed that the reaction was complete. The mixture was concentrated to get the crude material which was purified by using column chromatography on silica gel to give the desired product (261 mg, 81.6%) as an oil. LCMS (m/z): 168.1 [M+H]+.

Provenance & Evidence