Direct Photocatalytic S–H Bond Cyanation with Green “CN” Source
作者:Wei Guo、Wen Tan、Mingming Zhao、Lvyin Zheng、Kailiang Tao、Deliang Chen、Xiaolin Fan
DOI:10.1021/acs.joc.8b00887
日期:2018.6.15
Herein we report a novel C–S bond cleavage and reconstruction strategy for the synthesis of thiocyanates through direct photocatalytic S–Hbond cyanation from thiols and inorganic thiocyanate salts. In our strategy, the unprecedented example of cutting off C–S bond of SCN– to deliver the green “CN” sources is demonstrated. This transformation features nontoxic and inexpensive “CN” sources, available
Transition-metal-free synthesis of thiocyanato- or nitro-arenes through diaryliodonium salts
作者:Xiao-Hua Li、Liang-Gui Li、Xue-Ling Mo、Dong-Liang Mo
DOI:10.1080/00397911.2016.1181764
日期:2016.6.2
ABSTRACT A transition-metal-free approach to facile synthesis of thiocyanato- and nitro-arenes was developed from KSCN (potassiumthiocyanate) or NaNO2 with diaryliodonium salts in good yields under mild conditions. The reaction was compatible with a variety of sensitive functional substituents such as halides and nitro and ester groups. The usefulness of arylation products has been realized. GRAPHICAL
A novel electrophilic thiocyanating reagent, N-thiocyanato-dibenzenesulfonimide, was prepared and exhibited enhanced electrophilicity with a wide scope of substrates. Thus, it reacted with activated aromatics such as phenols, indoles, anilines and anisoles without a catalyst giving the corresponding thicyanate derivatives in high yields, while TfOH for unactivated arenes and hetero aromatics and Zn(OTf)2
Preparation of Arylthiocyanates Using N,N′-Dibromo-N,N′-bis(2,5-dimethylbenzenesulphonyl) ethylenediamine and N,NDibromo-2,5-dimethylbenzenesulphonamide in the Presence of KSCN as a Novel Thiocyanating Reagent
N-Bromosulphonamides, synthesized via direct bromination of sulphonamides, react with several types of arene substrates in the presence of KSCN to afford aryl thiocyanates. The method appears to be generally applicable to benzenoid substrates with a wide range of substituents, such as N,N-dimethylaniline, p-xylene, anisole, mesitylene and cumene.
Direct Cyanation of Thiophenols or Thiols to Access Thiocyanates under Electrochemical Conditions
作者:Cong Jiang、Yan Zhu、Heng Li、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.2c00995
日期:2022.8.5
A novel electrochemical cross-coupling method for the synthesis of thiocyanates via the direct cyanation of readily available thiophenols or thiols with trimethylsilyl cyanide (TMSCN) was developed. This approach was also suitable for selenols. External oxidant-free, transition-metal-free and mild operating conditions were the main advantages of this protocol. A series of thiocyanates and selenocyanates