A Mild One-pot Synthesis And Spectral Properties Of 3-arylacetylene Coumarins

3-Arylacetylene coumarins as one of important coumarins has been widely used in medicines,bioactive compounds,fluorescent probes/sensors and non-fullerene acceptors.Modifying C3 and C4 functional groups of coumarin could adjust the absorption and emission wavelength as well as enhance the fluorescence properties to achieve better optical properties.The traditional methods for the synthesis of 3-arylacetylene coumarins usually require multi-step reactions or pre-functionalization of substrates.Herein,we developed a mild one-pot method to synthesize 3-arylacetylene coumarins.The main research contents are as follows:1.We have developed a mild and efficient “one-pot” stepwise method to synthesize 3-arylvinyl-4-aryl-coumarins from alkynoates involving photosensitizer-free photocatalysis and thermocatalysis processes.This catalytic system showed the excellent functional group tolerance and substrate suitability.(Scheme 1).2.Based on the systematical spectral studies and X-ray single crystal diffraction analysis,it was found that some of the 3-arylvinyl-4-aryl-coumarins exhibit aggregation-induced emission(AIE)characteristics,is a potential AIE material.