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Paper | Regular issue | Vol 26, No. 10, 1987, pp.2639-2656
Published online, 1st January, 1970
DOI: 10.3987/R-1987-10-2639
Thienospirans V: Thienospirans via Directed Lithiations

Fritz Sauter, Peter Stanetty, Hannes Fröhlich, and Wolfgang Ramer

*IInstitute of Organic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria

Abstract

Using halogen-metal exchange and orthodirected metalation methodologies spiro[thieno[b]-furans] 2 and 3 were synthesized starting from 3-bromothiophene, in one case proceeding via cyclization of the 2,3-difunctionalized thiophenes 6 and in the other case proceeding via cyclization of the isomeric compounds 8.