CO₂-facilitated radical sequential (3 + 2) annulation of 1,6-enynes via cooperation of sulfinate catalysis and photocatalysis

Abstract

Reported here is the CO2-facilitated radical sequential (3+2) annulation of 1,6-enynes that proceeds under the concerted catalysis of sulfinate and photocatalyst (PC) to construct benzo-fused tricyclic scaffolds, that is, tetrahydrofluorenes...

CO2 promoted photoredox/Ni-catalyzed semi-reduction of alkynes with H2O

“…According to previous literature, 10 a ,15 the reaction might undergo oxidative addition of H 2 O with Ni(0) to form a stable Ni–OH bond and constrained the reaction. Inspired by previous studies on CO 2 promoted reactions, 16 we assumed that CO 2 might convert the hydroxyl group into an easy leaving bicarbonate group, which accelerated the reaction.…”