A co-operative effect of visible light photo-catalysis and CoFe₂O₄nanoparticles for green synthesis of furans in water

Abstract

A novel approach to poly-functionalized furan synthesis is disclosed via oxidative decarboxylative [3+2] cycloaddition using co-operative catalysis by visible light and CoFe2O4 nanoparticles.

Recent Advances of Cinnamic Acids in Organic Synthesis

“…A high temperature was good for the E configuration of alkenes . Furthermore, the cascade could involve a cyclization or oxidative coupling to get epoxides, ketones or furans (Scheme ). Reactions were typically carried out in the oxidants (such as di ‐tert‐butyl peroxide (DTBP), K 2 S 2 O 8 , Ag 2 O, tert ‐butyl hydroperoxide (TBHP), dicumyl peroxide (DCP)), electricity or photocatalysis conditions.…”

“…, acyl and ketonic radicals were reported. Toluene, boron reagents, aldehydes, acids, amides, ketones, ethers, alcohols, epoxides, nitriles were able to function as radical precursors.…”

“…Aryl groups in Ar position were better than heterocyclic ones for these transformations (71–90%). In 2017, the Rai gruoup observed another kind of decarboxylative cyclization, which led to furans in high yields (82–92%). The use of CoFe 2 O 4 catalyst not only increased the yield, but also accelerated the conversion rate, compared with catalyst‐free condition (4 h, 70%) in the presence of visible light.…”

Photocatalytic C(sp3)−H Activation towards α‐methylenation of Ketones using MeOH as 1 C Source Steering Reagent

“…In continuation of our interest in organic transformations, [19] we report herein, the first visible light-induced a-methyle-nation of ketones at room temperature using MeOH as 1-C source and Cu@g-C 3 N 4 as new and efficient photocatalyst without use of any oxidant, which is hitherto unreported and not accessible through any classical or modern approach reported till date for amethylenation of ketones (Scheme 1f). Alternatively, we anticipated to utilize methanol as 1 C-source for in situ generation and utilization of HCHO for a-Csp 3 ÀH methylenation.…”

“…Alternatively, we anticipated to utilize methanol as 1 C-source for in situ generation and utilization of HCHO for a-Csp 3 ÀH methylenation. In continuation of our interest in organic transformations, [19] we report herein, the first visible light-induced a-methyle- nation of ketones at room temperature using MeOH as 1-C source and Cu@g-C 3 N 4 as new and efficient photocatalyst without use of any oxidant, which is hitherto unreported and not accessible through any classical or modern approach reported till date for amethylenation of ketones (Scheme 1f).…”