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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Synthesis, structure and photophysical properties of novel thiazolo[2,3-b]pteridines
Daryna Kyrylova1, Oleksii Voskoboinik2, Anatolii Tatarets3
1Oles Honchar Dnipro National University, Nauky Ave. 72, Dnipro, 49010, Ukraine.
Abstract:
A one-pot synthesis of a series of thiazolo[2,3-b]pteridines, along with an alternative step-by-step procedure, has been developed. The regioselectivity of the heterocyclization was determined using a combination of physicochemical methods, including X-ray crystallography. The photophysical properties of the synthesized compounds, such as their absorption and emission spectra, were systematically investigated. The absorption spectra were found to depend on the electronic effects of the substituents and the length of the conjugated system. In acetonitrile solutions, the compounds exhibited luminescence with emission maxima in the range of 452-570 nm, quantum yields of up to 6.8%, and negligible Stokes shifts. These results were further supported by DFT calculations, which showed good agreement with the experimental data. Overall, the findings highlight the potential of thiazolo[2,3-b]pteridines as promising candidates for the development of efficient luminescent materials.
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