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Title
Japanese:Selective and Divergent Synthesis of Naphthalene‐ and Phenanthrene‐Fused Azahelicenes by Turning Rearrangement On or Off 
English:Selective and Divergent Synthesis of Naphthalene‐ and Phenanthrene‐Fused Azahelicenes by Turning Rearrangement On or Off 
Author
Japanese: 前田千尋, Sayaka Michishita, Tadashi Ema.  
English: Chihiro Maeda, Sayaka Michishita, Tadashi Ema.  
Language English 
Journal/Book name
Japanese:Chemistry – A European Journal 
English:Chemistry – A European Journal 
Volume, Number, Page        
Published date Jan. 27, 2025 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://dx.doi.org/10.1002/chem.202404325
 
DOI https://doi.org/10.1002/chem.202404325
Abstract <jats:title>Abstract</jats:title><jats:p>The Scholl reaction has been used to synthesize a variety of polycyclic aromatic hydrocarbons, where 1,2‐aryl shifts have sometimes occurred to yield unique rearrangement products. However, such 1,2‐aryl shifts are often uncontrollable, and the selective and divergent synthesis with or without rearrangement is desired. Here, we achieved the control of the rearrangement in the Scholl reaction of carbazoles by changing the <jats:italic>N</jats:italic>‐substituents. The Scholl reaction of 3,6‐bis{2‐(2‐naphthyl)phenyl}carbazoles and 3,6‐bis{2‐(9‐phenanthrenyl)phenyl}carbazoles with an <jats:italic>N</jats:italic>‐benzyl group gave multiple azahelicenes via double rearrangement, while those with an <jats:italic>N</jats:italic>‐benzoyl group gave aza[9]helicene and quadruple [4]helicene in the former and latter cases, respectively. The reaction mechanisms on the divergent reaction pathways were investigated by DFT calculations, which well supported the experimental results.</jats:p>

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