2-Hydrazinoethanol → 6-[2-(2-Hydroxyethyl)-5-methyl-3-oxo-2,3,4,5-tetrahydropyridazin-6-yl]-1-methyl-1,2,3,4-tetrahydroquinolin-2-one

Participants

Reaction Steps

A solution of 2.72 g of 4-oxo-4-(1-methyl-2-oxo-1,2,3,4-tetrahydroquinolin-6-yl)-3-methylbutanoic acid and 1.5 g of 2-hydrazinoethanol in 30 ml of ethanol was heated under reflux on a water bath for 2 hours. The reaction mixture was concentrated under reduced pressure and water was added to the residue. The precipitated crystals were filtered off and recrystallized from isopropanol to give 2.5 g of 6-[2-(2-hydroxyethyl)-5-methyl-3-oxo-2,3,4,5-tetrahydropyridazin-6-yl]-1-methyl-1,2,3,4-tetrahydroquinolin-2-one as colorless crystals, melting at 171°-173° C.

Provenance & Evidence