The reaction of 2,3,4,9-tetrahydro-1H-carbazol-1-ones with ethyl acetate yielded 2-acetyl-1-hydroxycarbazole and 2-acetyl-2,3,4,9-tetrahydro-1H-carbazol-1-one. These were used to prepare isoxazolo- and pyrazolo-fused carbazoles. Mechanisms for the formation of the end products are proposed.

This study demonstrates the synthesis of heteroannulated carbazoles using 2-acetyl-1-hydroxycarbazole and 2-acetyl-2,3,4,9-tetrahydro-1H-carbazol-1-one, which can be used to prepare isoxazolo- and

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2-Acetyl-2,3,4,9-tetrahydro-1H-carbazol-1-one in the Synthesis of Heteroannulated Carbazoles

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