Cross-Coupling Reactions of Aryl Halides with Amines, Phenols, and Thiols Catalyzed by an N,N′-Dioxide-Copper(I) Catalytic System

C-N, C-O and C-S Ullmann-Type Coupling Reactions of Arenediazonium o-Benzenedisulfonimides

Arenediazonium o-benzenedisulfonimides have been used as efficient electrophilic partners in Cu(I) catalysed Ullmann-type coupling. The synthetic protocols are mild and easy, and produced either N-alkylanilines, aryl ethers, or thioethers in fairly good yields (18 positive examples, average yield 66%). o-Benzenedisulfonimide was recovered at the end of the reactions and was reused to prepare the starting salts for further reactions. It is noteworthy that diazonium salts have been used as electrophilic partners in the Ullmann-type protocol for the first time.

Transition-Metal-Free O-Arylation of Alcohols and Phenols with S-Arylphenothiaziniums

Herein, we report the transition-metal-free O-arylation of alcohols and phenols with S-arylphenothiaziniums, which can be easily synthesized from boronic acids. Aryl substituents derived from arylboronic acids were selectively introduced into the hydroxy groups in alcohols and phenols, and a variety of aryl ethers were synthesized. This selectivity is supported by theoretical calculations.

Cu(i) based catalysts derived from bidentate ligands and studies on the effect of substituents for N-arylation of benzimidazoles and indoles

Four Cu(i) complexes [Cu(L^1–4)(Cl)(PPh₃)] (C1–C4) were synthesized, characterized and crystal structure of C1 was determined. Complexes were utilized as catalysts for N-arylation reaction. Probable mechanism for N-arylation reaction was proposed.

Cu(II) complex of pyridine-based polydentate as a novel, efficient, and highly reusable catalyst in C-N bond-forming reaction

In this paper, a highly reusable copper(II) complex of pyridine-based polydentate is able to efficiently catalyze a C-N bond-forming reaction under mild conditions. A variety of N-heterocyclic and amine compounds arylated with different aryl iodides, bromides, and chlorides produced N-substituted compounds in good to excellent yields. This methodology can be also used for the arylation of N-unsubstituted compounds using arylboronic acids under solvent-free conditions. All reactions are performed in short times under air, and the catalyst can be reused up to seven times.

tert-Butoxide mediated cascade desulfonylation/arylation/hydrolysis of cyclic sulfonyimines using diaryliodonium salts: synthesis of diaryl ether derivatives bearing a 2-aldehyde group

Cascades of cyclic sulfonyimines mediated by ^tBuOK with diaryliodonium salts has been developed, giving the diaryl ethers in good yields.

Synthesis and characterization of 1,3-diamino-graphene as a heterogeneous ligand for a CuI-catalyzed C–N coupling reaction

1,3-Diamino-graphene was synthesized and used as an efficient heterogeneous ligand for a CuI-catalyzed C–N coupling reaction.