A Catalytic Synthesis of Thiosilanes and Silthianes: Palladium Nanoparticle-Mediated Cross-Coupling of Silanes with Thio Phenyl and Thio Vinyl Ethers through Selective Carbon−Sulfur Bond Activation
摘要:
Palladium nanoparticles generated in situ from N,N-dimethyl-acetamide (DMA) solutions of PdX2 (X = Cl-, OAc-, OCOCF3-) or Pd-2(dba)(3) by reduction with alkyl silanes R3SiH (R = Me, Et, i-Pr, t-Bu) are selective catalysts for the cross-coupling of the silanes R3SiH with phenyl and vinyl thioethers forming the corresponding thiosilanes and silthianes in high yields and under mild conditions. The method is applicable to phenyl thioglycosides, giving access to thiosilyl glycosides a new class of sugar derivatives.
Radical reaction of S-phenyl chlorothioformate with alkyl iodides: free radical-mediated carboxylation approach
作者:Sunggak Kim
DOI:10.1039/a800664d
日期:——
Free radical-mediated carboxylation is achieved by treatment of alkyl iodides with S-phenyl chlorothioformate and bis(tributyltin) with irradiation at 300 nm.
Nickel-Catalyzed C–S Reductive Cross-Coupling of Alkyl Halides with Arylthiosilanes toward Alkyl Aryl Thioethers
作者:Yu-Zhong Yang、Yang Li、Gui-Fen Lv、De-Liang He、Jin-Heng Li
DOI:10.1021/acs.orglett.2c01954
日期:2022.7.22
A nickel-catalyzed C–S reductive cross-coupling of alkyl halides with arylthiosilanes for producing alkyl arylthioethers is developed. This reaction is initiated by umpolung transformations of arylthiosilanes followed by C–S reductive cross-coupling with alkyl halides to manage an electrophilic alkyl group onto the electrophilic sulfur atom and then construct a C(sp3)–S bond, and features exquisite
Nickel‐catalyzed umpolung C S radical reductive cross coupling of S‐(trifluoromethyl)arylsulfonothioates with alkyl halides
作者:Yu-Zhong Yang、Gui-Fen Lv、Ming Hu、Yang Li、Jin-Heng Li
DOI:10.1016/j.cclet.2023.108590
日期:2023.11
A new cooperative nickelreductive catalysis and N,N-dimethylformamide-mediated strategy for umpolung CS radical reductive cross coupling of S-(trifluoromethyl)arylsulfonothioates with alkyl halides to produce alkyl aryl thioethers is described. This reaction features excellent selectivity, wide functionality tolerance, broad substrate scope, and facile late-stage modification of biologically relevant
描述了一种新的协同镍还原催化和N,N-二甲基甲酰胺介导的策略,用于S- (三氟甲基)芳基硫代磺酸酯与烷基卤的 C S 自由基还原交叉偶联生产烷基芳基硫醚。该反应具有优异的选择性、广泛的功能耐受性、广泛的底物范围以及易于对生物相关分子进行后期修饰。机理研究认识到,通过用 Sn 热诱导 DMF还原,最初生成酰胺自由基阴离子,然后进行反极化还原和亲核磺酰基部分的单电子转移,形成巯基自由基并与 Ni 0 /Ni I /Ni III接合/Ni I催化循环。