108290-26-2Relevant academic research and scientific papers
The Preparation of Substituted 5H-Pyrazolo -Benzoxazin-5-ones from the Trianions of Certain Hydroxyphenylcarboethoxyhydrazones.
Mazat, Cynthia L.,Beam, Charles F.,Hines, Margaret A.
, p. 253 - 259 (2007/10/02)
The trianions of the carboethoxyhydrazones of o- and p-hydroxyacetophenones and related materials were prepared in an excess of lithium diisopropylamide (LDA), condensed with methyl salicylate or methyl 4-methoxysalicylate, and acid-cyclized to substituted pyrazolobenzoxazinones.
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).
