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A Chiral Thioxanthone as an Organocatalyst for Enantioselective [2+2] Photocycloaddition Reactions Induced by Visible Light

Authors


  • This project was supported by the Deutsche Forschungsgemeinschaft (DFG) and by the Fonds der Chemischen Industrie. R.A. is the recipient of an Alexander von Humboldt research fellowship. We thank Olaf Ackermann and Marcus Wegmann for help with the HPLC analysis.

Abstract

Thioxanthone 1, which was synthesized in a concise fashion from methyl thiosalicylate, exhibits a significant absorption in the visible light region. It allows for an efficient enantioselective catalysis of intramolecular [2+2] photocycloaddition reactions presumably by triplet energy transfer.

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