Metal-Free Iodine-Catalyzed Synthesis of Fully Substituted Pyrazoles and Its Sulphenylation

Synthesis of thiophosphates through a three-component reaction by using sulfur dioxide as the sulfur source

Generation of thiophosphates through a three-component reaction of diaryliodonium tetrafluoroborates, 1,4-diazabicyclo[2.2.2]octane-sulfur dioxide (DABCO·(SO₂)₂), and diarylphosphine oxides under visible light irradiation is described.

I2-Catalyzed Multicomponent Reactions for Accessing Densely Functionalized Pyrazolo[1,5-a]pyrimidines and Their Disulphenylated Derivatives

New I2-catalyzed multicomponent bicyclization reactions of β-ketonitriles with sulfonyl hydrazides have been established, providing a direct and metal-free access toward unreported pyrazolo[1,5-a]pyrimidin-4-ium sulfonates. The latter could be quantitatively converted into densely functionalized pyrazolo[1,5-a]pyrimidines in the presence of bases. Using sulfonyl hydrazides as a sulfenylating agent, the resulting pyrazolo[1,5-a]pyrimidines enabled I2-catalyzed unprecedented disulphenylations to access fully substituted pyrazolo[1,5-a]pyrimidines through direct C(sp(2))-H bond bifunctionalization.

Iodine-catalysed regioselective thiolation of flavonoids using sulfonyl hydrazides as sulfenylation reagents

Iodine-catalysed regioselective sulfenylation of flavonoids including flavone, flavonol, dihydroflavone, isoflavone and aurone derivatives by sulfonyl hydrazides was developed.

Iodine-catalyzed expeditious synthesis of sulfonamides from sulfonyl hydrazides and amines

A new synthesis of sulfonamides via an iodine-catalyzed sulfonylation of amines with arylsulfonyl hydrazides at room temperature is reported.

TBAI–HBr system mediated generation of various thioethers with benzenesulfonyl chlorides in PEG400

An efficient procedure was developed for the synthesis of aryl sulfides in good to excellent yields using TBAI–HBr system promoted direct sulfenylation of various compounds, such as phenols, pyrazolones, indoles and related heteroarenes.

Metal-free iodine-catalyzed direct cross-dehydrogenative coupling (CDC) between pyrazoles and thiols

A green and efficient iodine-catalyzed cross-dehydrogenative C–S coupling method for the synthesis of C-4 sulfenylated pyrazoles has been initially developed under metal-free conditions.

Iodine-catalyzed thiolation of electron-rich aromatics using sulfonyl hydrazides as sulfenylation reagents

Iodine-catalyzed thiolation of electron-rich aromatics, including substituted anisole, thioanisole, phenol, toluene, and naphthalene, using sulfonyl hydrazides as sulfenylation reagents was carried out.