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127. Syntheses and Reactions Of 5-Alkyl- and 5-Aryl-11b-Methyl-1,2,3,11b-tetrahydro-pyrido[3,2,1-jk]carbazoles Having a Strychnos Alkaloids Partial Structure

Stadlbauer W., Deeb A., Erklavec U., Rieder D., Schuiki B., Kappe T.,
in Proceedings of ECSOC-18, The Eighteenth International Electronic Conference on Synthetic Organic Chemistry, November 1-30, 2014;
http://www.sciforum.net/conf/ecsoc-18; http://www.sciforum.net/presentation/1012;
J. A. Seijas, M. P. Vázquez Tato, S. K. Lin (Eds). CD-ROM edition, ISBN 3-906980-26-x, Published in 2014 by MDPI AG, Basel, Switzerland.

Arylhydrazines 1 react with 2-methylcyclohexanone 2 via Fischer indole synthesis to 4a-methyl-2,3,3,4a-tetrahydro-1H-carbazoles 3, which cyclize with 2-substituted malonates 5 to give 5-aryl- and 5-alkylsubstituted 4-hydroxy-11b-methyl-1,2,3,11b-tetrahydro-6H-pyrido[3,2,1-jk]carbazol-6-ones 6. Pyridocarbazoles 6 can be shown to give a series of reactions, such as electrophilic halogenation to 5-chloro-pyridocarbazole-4,6-dione 9, and nucleophilic halogenation to 4-chloro-pyridocarbazol-6-one 11. 4-Azido-5-phenylpyridocarbazol-6-one 13 cyclizes under thermolysis to the indolo derivative 14. This reaction was studied by differential scanning calorimetry (DSC).

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