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Visible Light Photocatalytic Synthesis of Benzothiophenes

Durga Prasad Hari, Thea Hering and Burkhard König*

*Institut für Organische Chemie, Universität Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany, Email:

D. P. Hari, T. Hering, B. König, Org. Lett., 2012, 14, 5334-5337.

DOI: 10.1021/ol302517n

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A photocatalytic radical annulation process of o-methylthio-arenediazonium salts with alkynes yields substituted benzothiophenes regioselectively. Green light irradiation of eosin Y initiates the photoredox catalysis. The scope of the reaction was investigated by using various substituted diazonium salts and different alkynes.

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ID: J54-Y2012-3400