Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 228, Issue -, Pages 97-102Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.01.072
Keywords
Photocatalysis; Organic synthesis; Carbon nitride; Sulfur; Proton coupled electron transfer
Funding
- Deutsche Forschungsgemeinschaft [DFG-An 156 13-1]
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The remarkable bioactivity of 1,3,4-oxadiazoles permanently motivates chemists to develop new milder and broader approaches to synthesize new derivatives, as well as to improve the preparation methodologies of the known compounds. Potassium poly(heptazine imide), a well crystallized representative of carbon nitrides family, shows great performance as a heterogeneous and hence recyclable photocatalyst in the visible light driven oxidative cyclization of N-acylhydrazones to the corresponding oxadiazoles. The proposed method uses elemental sulfur as a cheap and selective electron scavenger. A series of 2,5-disubstituted-1,3,4-oxadiazoles bearing aryl, hetaryl and alkyl substituents were obtained with 42-84% isolated yield.
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