Methods for the synthesis of the earlier unknown N-substituted 2-(5,6,7,8-tetrafluoro-4-oxo-1,4-dihydroquinolin-3-yl)glyoxylic acids and their esters from copper chelate of ethyl pentafluorobenzoylpyruvate were developed. The structure of intermediate ethyl 4-(R-amino)-2-oxo-3-pentafluorobenzoylbut-3-enoates is discussed.
1-Aryl-3-ethoxalyl(heteryl)-5,6,7,8-tetrafluoroquinoxalinones(cinnolinones) read with morpholine to give 7-morpholino- and 5,7-dimorpholino derivatives, depending on the reaction conditions.
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作者:A. S. Fokin、Ya. V. Burgart、O. V. Ryzhkov、V. I. Saloutin
DOI:10.1023/a:1011325215083
日期:——
The title compounds react with o-phenylenediamine and o-aminophenol at the ethoxalyl fragment to form heteryl-substituted quinoxalones and benzooxazinones, respectively. o-Amino-benzenethiol acts as both an S-nucleophile replacing the F atom and an N-nucleophile replacing the carbonyl group in the ethoxalyl fragment. Under more drastic conditions, cyclization proceeds to form benzothiazinones.