Synthesis of α-sulfenyl monoketones via a metal-free oxidative cross dehydrogenative coupling (CDC) reaction

α-Sulfenyl ketones are potential precursors which find a variety of applications in organic synthesis.

Sulfenylation of β-Diketones Using C-H Functionalization Strategy

Sulfenylation of β-diketones is challenging as β-diketones undergo deacylation after sulfenylation in the reaction medium. The sulfenylation of β-diketones without deacylation under metal-free conditions at ambient temperature via a cross dehydrogenative coupling (CDC) strategy is reported. The resultant products can be further manipulated to form α,α-disubstituted β-diketones and pyrazoles.

Disulfide-based metal-free α-sulfanylation of ketones

An eco-friendly methodology for the direct α-sulfanylation of ketones has been developed by using diaryl disulfides as sulfanyl source affording ketosulfides in good to excellent yields and high selectivity.

I2-mediated sulfonylation and Na2SO3-mediated deacylation: a general protocol for the synthesis of β-keto sulfones and β-dicarbonyl sulfones

A general method for constructing both β-keto sulfones and β-dicarbonyl sulfones has been developed.

Tetrabutylammonium iodide-catalyzed oxidative coupling of enamides with sulfonylhydrazides: synthesis of β-keto-sulfones

A novel synthetic route toward pharmaceutically interesting β-keto-sulfone derivativesviaTBAI/TBHP-mediated oxidative coupling of readily prepared enamides with sulfonylhydrazides is described.

K2S2O8/I2 promoted syntheses of α-thio-β-dicarbonyl compounds via oxidative C–S coupling reactions under transition metal-free and solvent-free conditions

K₂S₂O₈/I₂ promoted C–S coupling reaction of β-diketone with disulfide has been described. The resulting α-thio-β-diketones compounds were obtained in good to excellent yields.

Palladium-catalyzed thiolation of alkanes and ethers with arylsulfonyl hydrazides

A new method for the preparation of alkyl aryl sulfides through direct oxidative thiolation of alkanes or ethers with arylsulfonyl hydrazides using DTBP as an oxidant catalyzed by Pd(OAc)₂ has been reported. The C–H bonds in various alkanes or ethers were successfully converted into C–S bonds with moderate to good yields.

Metal-free n-Et4NBr-catalyzed radical cyclization of disulfides and alkynes leading to benzothiophenes under mild conditions

The title reaction involves metal free TEAB-catalyzed S–S bond cleavage, C–S bond formation and C–C bond formation; it uses readily available disulfides and alkynes as substrates, and environmentally friendly TEAB as catalyst to synthesize useful benzothiophene derivatives.