Divergent synthesis of arylated pyridin-2(1H)-one derivatives via metal-catalysed cross-coupling processes

Ruthenium(II)-Catalyzed Remote C-H Sulfonylation of 2-Pyridones

Herein, a ruthenium-mediated remote C-H mono- and disulfonylation of 2-pyridones with arylsulfonyl chlorides is developed. The catalytic system consisting of a [Ru(p-cymene)Cl2]2 catalyst and KOAc additive allows 2-pyridones to undergo C3,C5-disulfonylation in 1,4-dioxane, and C5-sulfonylation when the C3-position of 2-pyridones is blocked. The successful transformation of the products and late-stage modification of estrone further highlighted the potential utility and significance of this synthetic protocol. Preliminary mechanistic studies indicated that the remote regioselectivity might be dictated via chelation-assisted ruthenation.

Selective synthesis of pyridyl pyridones and oxydipyridines by transition-metal-free hydroxylation and arylation of 2-fluoropyridine derivatives

An efficient protocol for the construction of various pyridyl pyridone and oxydipyridine derivatives through a hydroxylation and arylation tandem reaction of 2-fluoropyridines is reported. Under simple transition-metal-free conditions, the reaction provided a series of products in good to excellent yields, and their structures were confirmed by crystal diffraction analysis. Furthermore, the controlling effect of 6-position substituents on the highly selective synthesis of pyridone and oxydipyridine was studied.

Catalytic Method for the Synthesis of C-N-Linked Bi(heteroaryl)s Using Heteroaryl Ethers and N-Benzoyl Heteroarenes

C-N-linked bi(heteroaryl)s are synthesized by a rhodium-catalyzed N-heteroarylation reaction of N-benzoyl heteroarenes including azoles/azolones, pyridones, cyclic ureas, and cyclic imides using heteroaryl aryl ethers. The reaction involves the covalent bond-exchange reaction of N-CO and HetAr-O bonds without using metal bases and exhibits a broad applicability, giving diverse C-N-linked bi(heteroaryl)s containing five- and six-membered heteroarenes. The N-heteroarylation of N-H azoles/azolones and pyridone proceeds at higher reaction temperatures.

Divergent synthesis of 4,6-diarylated pyridin-2(1H)-ones from chalcones: novel access to 2,4,6-triaryl pyridines

A wide range of 4,6-diarylated-2(1H)-one derivatives were synthesized in excellent yields from chalcones in one pot. Further the designed 4,6-diarylated pyridin-2(1H)-one derivatives have been successfully utilized in synthesizing 2,4,6-triarylpyridines.

Reaction Mechanism of Vinamidinium Salts and Cyanoacetamide Derivatives

The mechanism of formation of a pyridin-2(1H)-one synthesised from vinamidinium salts and cyanoacetamide derivatives is illustrated through the preparation and characterisation of a key intermediate.