Liebigs Annalen der Chemie

Organic azides in heterocyclic synthesis, 12. Thermal cyclization of 4??azido??3??formyl??2??quinolones to isoxazolo [4, 3??c] quinolones

P Roschger, W Stadlbauer

Index: Roschger, Peter; Stadlbauer, Wolfgang Liebigs Annalen der Chemie, 1991 , # 4 p. 401 - 403

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Citation Number: 15

Abstract

Abstract Thermolysis of the 4-azido-3-formyl-2-quinolone 6, which was prepared from the 4- hydroxy-2-quinolone 1, afforded the ringclosed isoxazoloquinolone 7. 3- (Arylaminomethylene)-2, 4-quinolinediones 2 could not be transformed into an azide precursor in order to obtain the corresponding pyrazoloquinolone but yielded by attempted chlorination either 5-methyldibenzo [b, h][1, 6] naphthyridine-6 (5H)-one (9) or 4-chloro-3- ...