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47. Substitution and Ring Closure Reactions of Pyrido[3,2,1-jk]carbazol-6-ones
Hoai V. DANG, Bernd KNOBLOCH, Nargues S. HABIB, Thomas KAPPE and Wolfgang STADLBAUER
Eighth International Electronic Conference on Synthetic Organic Chemistry (ECSOC-8), http://www.mdpi.net/ecsoc-8, November 1-30, 2004, (www-Poster No. 43)

Abstract: 4-Hydroxy-pyrido[3,2,1-jk]carbazol-6-ones (3) which contain two biologically interesting structures, the indole and the 4-hydroxypyridone moiety, are obtained easily by cyclocondensation of carbazoles 1 (R' = H, OH) and monosubstituted malonates 2 . Nucleophilic substitution of the hydroxy group resulted in a number of reactive products such as 4-amino, 4-halogeno, 4-tosyloxy, 4-cyano or 4-azido compounds 4, which could be cyclized e.g. to indolo derivatives 5 or quinolino derivatives 6. Electrophilic substitution took place at the enolized CH-acidic 1,3-dicarbonyl function of 3 to give 5,5-disubstituted pyrido[3,2,1-jk]carbazole-4,6-diones 7 with alkyl, aryl, amino, azido, halogeno, hydroxy or nitro substituents in position 5. The oxo function in position 4 could be exchanged against a carbon function such as alkyl or alkyidene substituents (e.g. 6-oxo-pyrido[3,2,1-jk]carbazol-4-ylideneacetate 8).

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