108290-23-9Relevant articles and documents
The Preparation of Selected Benzopyranopyrazoles by the Condensation of C(α),N-Dilithiocarboalkoxyhydrazones and Salicylate Esters
Huff, Ann M.,Beam, Charles F.
, p. 1343 - 1346 (2007/10/02)
Selected C(α),N-dilithiocarboalkoxyhydrazones were prepared in an excess of lithium diisopropylamide (LDA) and condensed with a variety of salicylate esters to give intermediates that were acid-cyclized to benzopyranopyrazoles (coumarin-pyrazoles).