Iridium and phosphine promoted C–F bond activation: the C–S cross-coupling of aryl fluorides with diaryl disulfides to synthesize thioethers
摘要:
Carbon fluorine bond is the strongest known single bond to carbon and proved very difficult to cleave. An iridium and phosphine promoted C-F bond activation was developed, for the first time achieving the C-S cross-coupling reaction of disulfides with aryl fluorides using iridium complex. The corresponding monoarylthiolation products were obtained at moderate to good yields. Thus, it represents a new method for the synthesis of aryl sulfides through C-F bond activation. (C) 2015 Elsevier Ltd. All rights reserved.
Palladium Nanoparticles Immobilized on Nanosilica Triazine Dendritic Polymer (Pd np -nSTDP) as Catalyst in the Synthesis of Mono-, Di-, and Trisulfides through C–S Cross-Coupling Reactions
A wide variety of diaryl sulfides has been synthesized in excellent yields via C–S cross-couplings of aryl/heteroaryl halides with aromatic/heteroaromatic thiols in the presence of palladiumnanoparticlesimmobilized on nanosilica triazinedendriticpolymer (Pd np -nSTDP) as a reusablecatalyst under thermal conditions and microwave irradiation. Pd np -nSTDP also showed excellent catalytic activity
A sulfur-containing auxiliary enabled palladium-catalyzed C(carbonyl)–C bond activation of amides was reported to form phenylcarbamate derivatives with alcohols. Both alkyl and benzyl alcohols could be employed well with yields up to 85%. Derivations from phenylcarbamates to ureas and thiocarbamates illustrated the potential applications of this sequential C–C cleavage/C–O coupling reaction.
Cu-Catalyzed One-Pot Synthesis of Unsymmetrical Diaryl Thioethers by Coupling of Aryl Halides Using a Thiol Precursor
作者:D. J. C. Prasad、Govindasamy Sekar
DOI:10.1021/ol103041s
日期:2011.3.4
potassium ethyl xanthogenate as a thiol surrogate is developed. This new protocol avoids usage of intricate thiols and makes use of its easily available xanthate as a precursor, and thiol will be generated in situ to prepare the diaryl thioethers through a Cu-catalyzed double arylation. This strategy was further successfully utilized for the synthesis of symmetrical diaryl thioethers, arylalkyl thioethers
Tipping the Balance between S-π and O-π Interactions
作者:Jungwun Hwang、Ping Li、Mark D. Smith、Constance E. Warden、Dominic A. Sirianni、Erik C. Vik、Josef M. Maier、Christopher J. Yehl、C. David Sherrill、Ken D. Shimizu
DOI:10.1021/jacs.8b07617
日期:2018.10.17
comprehensive experimental survey consisting of 36 molecular balances was conducted to compare 18 pairs of S-π versus O-π interactions over a wide range of structural, geometric, and solvent parameters. A strong linear correlation was observed between the folding energies of the sulfur and oxygen balances across the entire library of balance pairs. The more stable interaction systematically switched
cascade radicalC(sp2/sp3)-S bond cleavage and group-transfer cyclization is disclosed. Triggered by alkyl radicals, varieties of 2-isocyanoaryl thioethers containing aliphatic, aryl, and heteroaromatic groups can be cleaved and precisely reinstalled to give benzothiazole derivatives. Mechanistic studies reveal that the cascade reaction undertakes an intermolecular pathway, and the inner radical sources