With ethylene glycol as a green solvent, a general transition metal‐free photocatalytic system using 9‐mesityl‐10‐methylacridinium perchlorate (Acr+−Mes ⋅ ClO4−) as catalyst was developed for the synthesis of sulfone‐containing heterocycles including thioflavones, oxindoles, and quinoline‐2,4(1H,3H)‐diones through the cascade sulfonation/cyclization reactions under the irradiation of blue light at room temperature.magnified image
A general transition-metal-free photocatalytic decarboxylative 3-alkylation reaction of 2-aryl-2H-indazoles was developed under visible-light irradiation under mild conditions. By employing dimethyl carbonate as a green solvent, 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) as an inexpensive...
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