Metal-Free Thiocarbamation of Quinolinones: Direct Access to 3,4-Difunctionalized Quinolines and Quinolinonyl Thiocarbamates at Room Temperature

Photocatalytic three-component reaction for synthesis of dithio-carbamates

This manuscript describes a visible light induced photocatalytic three-component reaction of an alkyl halide ([(iodomethyl) sulfonyl] benzene or arylmethyl bromide), carbon disulfide, and amine for the synthesis of dithiocarbamates under mild conditions. Sulfonyl dithiocarbamates were synthesized within 30 minutes without the need for any catalysts and additives. The reaction is characterized by high efficiency, wide substrate scope, a green catalyst-free protocol, and the easiness for scale-up. A possible reaction mechanism was suggested on the basis of free radical trapping and UV absorption spectroscopy experiment.

Bis(dialkylaminethiocarbonyl)disulfides Act as Electron Acceptors for EDA Complexes for the Synthesis of Dithiocarbamate Derivatives under Visible Light

This study proposes a green and efficient atom- and step-economical method for converting hazardous CS2 to dithiocarbamate derivatives under visible light irradiation and catalyst-free conditions. By the construction of novel C-S and C-N bonds, a series of β-dicarbonyl compounds and amines are incorporated into the products. Under light, CS2 and amine first form bis(dialkylaminethiocarbonyl)disulfides, which then react with K2CO3-activated β-dicarbonyl compounds to form electron donor-acceptor (EDA) complexes and subsequently generate the target products. This study confirms for the first time that bis(dialkylaminethiocarbonyl)disulfides can act as electron acceptors to form an EDA complex with β-dicarbonyl compounds, which are then coupled to form the target product under light.

Direct C-H Sulfuration: Synthesis of Disulfides, Dithiocarbamates, Xanthates, Thiocarbamates and Thiocarbonates

In light of the important biological activities and widespread applications of organic disulfides, dithiocarbamates, xanthates, thiocarbamates and thiocarbonates, the continual persuit of efficient methods for their synthesis remains crucial. Traditionally, the preparation of such compounds heavily relied on intricate multi-step syntheses and the use of highly prefunctionalized starting materials. Over the past two decades, the direct sulfuration of C-H bonds has evolved into a straightforward, atom- and step-economical method for the preparation of organosulfur compounds. This review aims to provide an up-to-date discussion on direct C-H disulfuration, dithiocarbamation, xanthylation, thiocarbamation and thiocarbonation, with a special focus on describing scopes and mechanistic aspects. Moreover, the synthetic limitations and applications of some of these methodologies, along with the key unsolved challenges to be addressed in the future are also discussed. The majority of examples covered in this review are accomplished via metal-free, photochemical or electrochemical approaches, which are in alignment with the overraching objectives of green and sustainable chemistry. This comprehensive review aims to consolidate recent advancements, providing valuable insights into the dynamic landscape of efficient and sustainable synthetic strategies for these crucial classes of organosulfur compounds.