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The reaction of ethyl chromone‐2‐carboxylates with 1,2‐diaminobenzene
Author(s) -
Markees Diether G.
Publication year - 1989
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.5570260107
Subject(s) - chemistry , chromone , tautomer , ring (chemistry) , condensation , medicinal chemistry , oxalate , carboxylate , organic chemistry , physics , thermodynamics
Ethyl chromone‐2‐carboxylate and all its benzoanalogs were prepared and caused to react with 1,2‐diami‐nobenzene to give 2‐(2‐hydroxybenzoyl)methinyl‐3‐oxo‐1,2,3,4‐tetrahydroquinoxaline and its benzo analogs. The condensation products of diethyl oxalate and methyl hydroxyaryl ketones which were required for the preparation of the starting esters, were found to be subject to ring chain tautomerism.