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8550439 
Journal Article 
Intermolecular oxidative annulation of 2-aminoanthracenes to diazaacenes and aza[7]helicenes 
Goto, K; Yamaguchi, R; Hiroto, S; Ueno, H; Kawai, T; Shinokubo, H 
2012 
Yes 
Angewandte Chemie (International Edition)
ISSN: 1433-7851
EISSN: 1521-3773 
51 
41 
10333-10336 
English 
Which way to go: The product distribution in the efficient oxidation of 2-aminoanthracene derivatives to pyrazine- and pyrrole-fused bisanthracenes can be controlled by additives (see scheme; TFA=trifluoroacetic acid, DDQ=2,3-dichloro-5,6-dicyano-1,4-benzoquinone). The pyrrole-fused dimer can be regarded as an aza[7]helicene with a stable helical conformation. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. 
anthracenes; fused rings; helicenes; N heterocycles; oxidation