Photoinitiated decarboxylative C3-difluoroarylmethylation of quinoxalin-2(1)-ones with potassium 2,2-difluoro-2-arylacetates in water.

An efficient and green strategy for the preparation of C3-difluoroarylmethylated quinoxalin-2(1)-one a visible-light-induced decarboxylative C3-difluoroarylmethylation of quinoxalin-2(1)-one with potassium 2,2-difluoro-2-arylacetate in water at room temperature was developed. This photoinduced reaction generated the desired products in good yields under simple and mild conditions.

Visible-light induced decarboxylative C2-alkylation of benzothiazoles with carboxylic acids under metal-free conditions.

An effective protocol of photoredox catalyzed C2-alkylation of benzothiazoles with aliphatic carboxylic acids was disclosed. In the presence of an acridinium salt as a photocatalyst and air as an oxidant, a wide range of secondary or tertiary aliphatic carboxylic acids were employed as alkylation reagents, providing the desired products in good to excellent yields under mild reaction conditions with a broad substrate scope.

Visible-light-induced tandem cyclization of 2-alkynylanilines with disulfides: a convenient method for accessing benzothiophenes under transition-metal-free and photocatalyst-free conditions.

A simple and efficient strategy for the preparation of benzothiophenes via visible-light-induced cyclization of 2-alkynylanilines with disulfides was developed. The reaction afforded the desired products in good yields at room temperature under transition-metal-free and photocatalyst-free conditions.

Visible-light-induced and iron-catalyzed methylation of N-arylacrylamides with dimethyl sulphoxide: a convenient access to 3-ethyl-3-methyl oxindoles.

A visible-light-induced and iron-catalyzed methylation of arylacrylamides by dimethyl sulphoxide (DMSO) is achieved, leading to 3-ethyl-3-methyl indolin-2-ones in high yields. This reaction tolerates a series of functional groups, such as methoxy, trifluoromethyl, cyano, nitro, acetyl and ethyloxy carbonyl groups. The visible-light promoted radical methylation and arylation of the alkenyl group are involved in this reaction.