67056-52-4Relevant academic research and scientific papers
Condensation of N-3-substituted 5-pyrazolones with esters of β-keto acids. Synthesis of pyrano[2,3-c]pyrazol-6-ones
Nam,Grandberg
, p. 326 - 330 (2008/02/03)
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. 2006 Springer Science+Business Media, Inc.
Condensation of pyrazol-5-ones unsubstituted in the position 1 with β-keto esters. Synthesis of pyrano[2,3-c]pyrazol-6-ones
Nam,Grandberg
, p. 387 - 392 (2007/10/03)
The thermal condensation of β-keto esters and N-unsubstituted pyrazol-5-ones gives good yields of pyrano[2,3-c]pyrazol-6-ones. Other potential routes for the condensation are not realized. The β-diketones react via another scheme to form noncyclic reactio
