General and Practical Formation of Thiocyanates from Thiols
作者:Reto Frei、Thibaut Courant、Matthew D. Wodrich、Jerome Waser
DOI:10.1002/chem.201406171
日期:2015.2.2
A new method for the cyanation of thiols and disulfides using cyanobenziodoxol(on)e hypervalent iodine reagents is described. Both aliphatic and aromatic thiocyanates can be accessed in good yields in a few minutes at room temperature starting from a broad range of thiols with high chemioselectivity. The complete conversion of disulfides to thiocyanates was also possible. Preliminary computational
5‐(Cyano)dibenzothiophenium Triflate: A Sulfur‐Based Reagent for Electrophilic Cyanation and Cyanocyclizations
作者:Xiangdong Li、Christopher Golz、Manuel Alcarazo
DOI:10.1002/anie.201904557
日期:2019.7.8
and its reactivity as electrophilic cyanation reagent evaluated. The scalable preparation, easy handling and broad substrate scope of the electrophilic cyanation promoted by 9, which includes amines, thiols, silyl enol ethers, alkenes, electron rich (hetero)arenes and polyaromatic hydrocarbons, illustrate the synthetic potential of this reagent. Importantly, Lewis acid activation of the reagent is not
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
One-pot synthesis of (ethoxycarbonyl)difluoromethylthioethers from thiocyanate sodium and ethyl 2-(trimethylsilyl)-2,2-difluoroacetate (TMS-CF 2 CO 2 Et)
作者:Lijun Xu、Hongyu Wang、Changwu Zheng、Gang Zhao
DOI:10.1016/j.tet.2017.08.048
日期:2017.10
An efficient one-pot cascade methodology for the synthesis of (ethoxycarbonyl)difluoromethyl thioethers is described. Benzyl, allyl, alkyl halides or diazonium salts as the starting materials together with thiocyanate sodium and TMS-CF2CO2Et in the presence of CsF or NaOAc afford a variety of the fluoroalkylthiolated products in moderate to good yields.
描述了一种用于合成(乙氧基羰基)二氟甲基硫醚的有效的一锅级联方法。在CsF或NaOAc的存在下,以苄基,烯丙基,烷基卤化物或重氮盐为起始原料,与硫氰酸钠和TMS-CF 2 CO 2 Et一起,以中等至良好的收率提供了多种氟代烷基硫代产物。
Copper-catalyzed cyanothiolation to incorporate a sulfur-substituted quaternary carbon center
thiocyanates to generate α-arylthioalkanenitriles bearing sulfur-substituted quaternarycarboncenter atoms has been described. This novel protocol involves the procedure of copper carbene species promoting S–CN bond cleavage and C–CN/C–S bond reconstruction to introduce both sulfur and cyano groups onto a single carboncenter. This cyanothiolation reaction will greatly enhance the synthetic utility of