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Paper | Regular issue | Vol 43, No. 2, 1996, pp.367-379
Published online, 1st January, 1970
DOI: 10.3987/COM-95-7270
Behavior of Oxotetrahydrobenzo[b]- and [c]thiophenes and Their α-Hydroxymethylene Derivatives in the Fischer Indole Synthesis

Laurent Martarello, Delphine Joseph, and Gilbert Kirsch*

*Laboratoire de Chimie Organique, Université de Metz, Ile du Saulcy, F-57045 Metz cedex, France

Abstract

We described an approach to thienocarbazoles via a Fischer indole synthesis starting directly from oxotetrahydrobenzo[b]- and [c]thiophenes or from their α-hydroxymethylene derivatives with a Japp-Klingemann reaction to make the hydrazones which are cyclised under acidic conditions.