Hydrochloric Acid → 6-Chloro-1H-pyrazolo[4,3-c]pyridin-3-ol

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Reaction Steps

Into a 50-L reactor was placed ethanol (22 L), sodium hydroxide (800 g, 20.00 mol), and 6-chloro-4-hydrazinylnicotinate (2700 g, 13.39 mol). The resulting solution was stirred for 2 h at room temperature. The pH value of the solution was adjusted to 7 with HCl. The solid was filtered out. The filtrate was concentrated in vacuo to give 6-chloro-1H-pyrazolo[4,3-c]pyridin-3(2H)-one, which was carried onto the next step without further purification. MS ESI calc'd. for C6H4ClN3O [M+1]+ 170. found 170.

Provenance & Evidence