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78. Heteroelectrocyclic Reaction of 4-Azido-3-hydrazonoalkylquinolines to 2-Arylaminopyrazolo[4,3-c]quinolines (Organic azides in heterocyclic synthesis, 27)
G. Hojas, W. Fiala, W. Stadlbauer, J. Heterocycl. Chem., 37, 1559-1569 (2000).

Abstract: 4-Azido-3-acylquinolones 4 obtained from 4-hydroxy derivatives 1 via tosylates 3 or chlorides 5, reacted with arylhydrazines 6 to 4-azido-3-hydrazonoalkylquinolines 7. Thermolysis of 7 gave ring closure products which were assigned to 2-arylaminopyrazolo[4,3-c]quinolones 10. The thermal decomposition conditions of the azides 4 and 7 were studied by differential scanning calorimetry (DSC).

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