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Synthesis and ring closure reactions of pyrido[3,2,1-jk]carbazol-6-ones

✍ Scribed by Hoai V. Dang; Bernd Knobloch; Nargues S. Habib; Thomas Kappe; Wolfgang Stadlbauer

Publisher
Journal of Heterocyclic Chemistry
Year
2005
Tongue
English
Weight
94 KB
Volume
42
Category
Article
ISSN
0022-152X

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✦ Synopsis

4-Hydroxy-5-phenylpyrido[3,2,1-jk]carbazol-6-ones (4, 5), which were obtained from carbazoles 1 and malonates 2 or 3, were converted to reactive intermediates such as 4-chlorides 9 or 4-tosylates 10, which gave in turn 4-azido-5-phenyl derivatives 11. 5-Alkyl-4-azides 11 were not obtained in this manner; however a new one-pot azidation reaction was developed starting from 4-hydroxy derivatives 4 which gave azides 11 in good yields. 4-Azido-5-phenyl derivative 11f cyclized on thermolysis to the indole 12. The thermal behaviour of the azides 11 was studied by thermoanalytical methods (DSC).

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