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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Donor-Acceptor-Substituted 5-Azaazulenes
Enikő Meiszter1,2, Gábor Turczel3, András Stirling1,4
1Institute of Organic Chemistry, HUN-REN Research Centre for Natural Sciences, 1117 Budapest, Hungary.
None:
The synthesis of 5-azaazulenes with both donor and acceptor substituents on their seven-membered rings is reported through the ring expansion of stable azapentalene derivatives upon reaction with dimethyl acetylenedicarboxylate. Regioisomeric products were obtained and characterized. The mechanism of the transformation and the excited state energy levels of the products were studied computationally, suggesting that these structures can be entry points to chromophore design for organic photonics applications.
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