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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
[4 + 4] photodimerization of azaanthracenes in both solution and solid phase controlled by cation-π interactions
Shinji Yamada1, Chiaki Kawamura
1Department of Chemistry, Ochanomizu University, Bunkyo-ku, Tokyo, Japan. yamada.shinji@ocha.ac.jp
Abstract:
Regio- and stereoselective [4 + 4] photodimerization reactions of 1- and 2-azaanthracenes were performed in both methanol solution and solid phases to give anti-HT dimers in high yields. In these reactions, intermolecular cation-π interactions between the pyridinium cation and the benzene ring play a key role in preorientation prior to the photodimerization reactions.
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