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The preparation of selected benzopyrano[3,4‐ b ]pyrazoles by the condensation of c(α), n ‐dilithiocarboalkoxyhydrazones and salicylate esters
Author(s) -
Huff Ann M.,
Beam Charles F.
Publication year - 1986
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570230515
Subject(s) - chemistry , lithium diisopropylamide , coumarin , methyl salicylate , condensation , organic chemistry , lithium (medication) , medicinal chemistry , ion , physics , thermodynamics , medicine , ecology , deprotonation , biology , endocrinology
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 benzopyrano[3,4‐ b ]pyrazoles (coumarin‐pyrazoles).
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