1-(1-Phthalazinyl)- and 1-(4-methoxyphenyl)-6,6-dimethyl-4-oxo-4,5,6,7-tetrahydroindazole

Abstract

2-(1-Phthalazinylhydrazino)methylene- (IIIa) or 2-(1-phthalazinylhydrazino)ethylidene-5,5-dimethyl-1,3-cyclohexanediones (IIIb) were prepared from 1-hydrazinophthalazine and 2-formyl- or 2-acetyldimedone. Cyclization of IIIb in the presence of p- TsOH gave 1-(1-phthalazinyl)-3,6,6-trimethyl-4-oxo-4,5,6,7-tetrahydroindazole. Reaction of 4-methoxyphenylhydrazine with 2 formyl- and 2-acetyldimedone gave the corresponding 1-(4-methoxyphenyl)-4-oxo-4,5,6,7-tetrahydroindazole. In the case of 2-formyldimedone the intermediate 2-(4-methoxyphenylhydrazinomethylene)-5, 5-dimethyl-1,3-cyclohexanedione was isolated.

How to Cite
Strakov, A. Y.; Strakova, I. A.; Petrova, M. V. Chem. Heterocycl. Compd. 1996, 32, 610. [Khim. Geterotsikl. Soedin. 1996, 708.]

For this article in the English edition, see DOI https://doi.org/10.1007/BF01164795