CONDENSATION OF N-3-SUBSTITUTED 5-PYRAZOLONES WITH ESTERS OF β-KETO ACIDS. SYNTHESIS OF PYRANO[2,3-<i>c</i>]PYRAZOL-6-ONES

Abstract

N-Substituted 5-pryazolones undergo thermal condensation with esters of β-keto acids, losing water and alcohol molecules, to form N-substituted pyrano[2,3-c]pyrazol-6-ones. The pyran ring in these products is readily cleaved by the action of alkali to give the corresponding salts of unsaturated acids.

How to Cite
Nam, N. L.; Grandberg, I. I.  Chem. Heterocycl. Compd. 2006, 42, 326. [Khim. Geterotsikl. Soedin. 2006, 367.]

For this article in the English edition, see DOI 10.1007/s10593-006-0089-z