Hydrochloric Acid → 4,7-dihydro-1,6-dimethyl-3-phenyl-4-(2-methylphenyl)-1H-pyrazolo[3,4-b]pyridin-5-carboxylic acid ethyl ester, hydrochloride

Beteiligte Stoffe

Reaktionsschritte

Ethyl-2-(2-methylbenzyliden)acetoacetate (0.050 mol) is added to 1-methyl-3-phenyl-5-pyrazolamine (0.050 mol) in ethanol (50 ml) and refluxed for 90 minutes. The mixture is then cooled to room temperature, further ethyl-2-(2-methylbenzyliden)acetoacetate (0.050 mol) is added thereto, and the mixture refluxed for further 90 minutes. The reaction mixture is then cooled, the solvent is evaporated, and the residue is taken up in ethyl ether, collected by filtration, and dried. The product is dissolved in methanol and a mixture of hydrochloric acid and methanol (45 mmol of HCl) is added thereto. The product of the title precipitates by adding ethyl ether. M.p. 187° C. (dec.).

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