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Structural elaboration of dicyanopyrazine: towards push-pull molecules with tailored photoredox activity
Authors: Hloušková Zuzana | Klikar Milan | Pytela Oldřich | Almonasy Numan | Růžička Aleš | Jandová Veronika | Bureš Filip
Year: 2019
Type of publication: článek v odborném periodiku
Name of source: RSC Advances
Publisher name: ROYAL SOC CHEMISTRY
Place: CAMBRIDGE
Page from-to: 23797–23809
Titles:
Language Name Abstract Keywords
cze Strukturální modifikace dikyanopyrazinu: push-pull molekuly s cílenou fotoredoxní aktivitou Byla připravena série push-pull molekul tvaru písmene X na bázi dikyanpyrazinu se systematicky měněnou strukturou. Vztahy mezi strukturou a vlastnostmi derivátů byly detailně zkoumány rozličnými experimentálními technikami a také teoretickými kalkulacemi. Dikyanpyraziny se jeví jako účinné fotoredoxní katalyzátory. methylaniliny; karboxylové kyseliny; katalýza; cyklizace; tetrahydrochinoliny
eng Structural elaboration of dicyanopyrazine: towards push-pull molecules with tailored photoredox activity As an extension of the successful dicyanopyrazine photoredox catalysts, a series of X-shaped push-pull molecules with a systematically altered structure were designed and facilely synthesized; their structure-property relationship was elucidated in detail via experimental as well as theoretical calculations. Dicyanopyrazines are proven to be powerful photoredox catalysts with a push-pull arrangement that allows facile property tuning by interchanging a particular part of the D-pi-A system. Changing the mutual position of the cyano acceptors and the methoxy, methylthio and thienyl donors as well as modifying the linker allowed wide tuning of the fundamental properties of the catalysts. Contrary to the currently available organic photoredox catalysts, we provided a series of catalysts based on a pyrazine heterocyclic scaffold with easy synthesis and further modification, diverse photoredox characteristics and wide application potential across modern photoredox transformations. The photoredox catalytic activities of the target catalysts were examined in a benchmark cross-dehydrogenative coupling and novel and challenging annulation reactions. light-mediated synthesis; merging photoredox; aromaticity index; n-methylanilines; carboxylic-acids; metal-free; catalysis; derivatives; cyclization; tetrahydroquinolines

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