A catalyst-free and oxidant-free C–H arylation of xanthenes and thioxanthenes using electrochemistry has been developed, which affords a number of cross-coupling products in moderate to good yields.
A novel synthesis of xanthenes and ethylphenols by the reaction of phenol with CaC2 without catalysts and solvents.
This review covers the recent progress in electrochemically enabled radical-mediated aryl/alkenyl C(sp2)–C(sp3) cross-coupling reactions, including synthetic strategies, plausible mechanisms and further research outlook.
An electrochemical benzylic C(sp3)–H cross-coupling with organotrifluoroborates without any catalyst or external electrolyte has been developed.
A straightforward strategy for the direct incorporation of sulfonyl units into a xanthene moiety for accessing xanthen-9-sulfone derivatives has been established via metal-free radical–radical cross-coupling reaction of xanthenes and sulfonyl hydrazides.