Visible-Light-Driven Radical Multicomponent Reaction of 2-Vinylanilines, Sulfonyl Chlorides, and Sulfur Ylides for Synthesis of Indolines

A visible-light-driven photoredox-catalyzed multicomponent reaction of 2-vinylanilines, sulfonyl chlorides, and sulfur ylides is described. This protocol features redox-neutral mild conditions, a broad substrate scope, and good functional group tolerance, providing access to various sulfonated 2,3-disubstituted indolines. The product can be transformed to a diverse range of functionalized indoles by a selective aromatization/nucleophilic substitution process. Mechanistic investigations suggest that both sulfonyl chlorides and sulfur ylides serve as radical sources, and the reaction proceeds through a sequential radical addition/addition/thermal S_N2-substitution process.

Photoinduced strategies towards strained molecules

Photoinduced strategies towards radical reactions of [1.1.1]propellane and bicyclo [1.1.0]butanes by photoredox or metallaphotoredox catalysis have recently been disclosed, enabling controllable construction of 1,3-difunctionalized bicyclo[1.1.1]pentanes and cyclobutanes.

Visible light catalyzed reaction of α-bromochalcones with chalcones: direct access to the urundeuvine scaffold

The α-keto vinyl radicals generated from α-bromochalcones under visible light photoredox catalyzed conditions were trapped by chalcones.

Visible light catalyzed Mannich reaction between tert-amines and silyl diazoenolates

The present work documents the α-C–H functionalization of tertiary amines via the visible light catalyzed Mannich reaction with silyl diazoenolates.

Synthesis of α-diazo-β-keto esters, phosphonates and sulfones via acylbenzotriazole-mediated acylation of a diazomethyl anion

We report a method for the synthesis of α-diazo-β-keto esters, phosphonates and sulfones via acylation of corresponding diazomethyl anions with N-acylbenzotriazoles. The N-o-amino-acylbenzotriazoles exhibited an unprecedented transphosphorylation reaction leading to diazoacetyl phenylphosphoramidates.

Visible light catalyzed methylsulfoxidation of (het)aryl diazonium salts using DMSO

The visible light catalyzed methylsulfoxidation of (het)aryl diazonium salts using DMSO is illustrated.

Synthesis of α-diazo-β-keto esters, phosphonates and sulfones via acylbenzotriazole-mediated acylation of a diazomethyl anion

The N-o-amino-acylbenzotriazoles exhibited an unprecedented transphosphorylation reaction leading to diazoacetyl phenylphosphoramidates.

Substituent controlled reactivity switch: selective synthesis of α-diazoalkylphosphonates or vinylphosphonates via nucleophilic substitution of alkyl bromides with Bestmann–Ohira reagent

We report a substituent controlled nucleophilic displacement of alkyl bromides with Bestmann–Ohira reagent yielding either dimethyl diazoalkylphosphonates or (E)-vinylphosphonates.