Synthesis of 4-acetoxy-3-methyl-6H-pyrido[4,3-b]carbazole (11) and the isomeric pyrido[3,4-b]carbazole (14) are described. The key step involves condensation of indolylmagnesium bromide with 3-acetoxy-5-acetoxy-methyl-4-hydroxymethyl-2-methylpyridine (2).
T. Kametani, T. Suzuki, K. Takahashi, Y. Ichikawa and K. Fukumoto, J. Chem. Soc., Perkin Trans. 1, 1975, 413 DOI: 10.1039/P19750000413
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