Acetic Acid → 8-chloro-4,5-dihydro-5-formyl-1-methyl-1H-pyrazolo[4,3-c]quinoline

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Reaction Steps

Methylhydrazine (52.5 g) was dropwise to a mixture of 6-chloro-1-formyl-3-hydroxymethylene-4-oxo-1,2,3,4-tetrahydroquinoline (276 g) and acetic acid (13 ml) in methanol (2.76 liters) at 10° C. to 12° C. over a period of 10 minutes. After being stirred for 1.5 hours at the same temperature, the resulting precipitate was collected by filtration, washed with methanol and dried to give 8-chloro-4,5-dihydro-5-formyl-1-methyl-1H -pyrazolo[4,3-c]quinoline (174 g).

Provenance & Evidence