Conversion of primary alcohols to the corresponding thiocyanates was effected by constant-current electrolysis of thiocyanate ion in dichloromethane containing an alcohol, triphenylphosphite, and 2, 6-lutidinium perchlorate or tetrafluoroborate. The electrolysis was performed at ambient temperature in a one-compartment cell using a graphite plate and a platinum plate as the anode and the cathode, respectively. 2, 6-Lutidinium cation effectively extracted thiocyanate ion into the organic phase from sodium thiocyanate suspended in the reaction mixture.
one-step synthesis of thiocyanates through C–O bond cleavage of readily available alcohols with ammonium thiocyanate as the thiocyanating agent was developed. The method avoids the use of additional catalyst, and a variety of (hetero)arene, alkene and aliphatic alcohols reacted with high efficiency in ethyl acetate under mild conditions to afford the corresponding thiocyanates in excellent to quantitative
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。
Phosphorus pentasulfide mediated conversion of organic thiocyanates to thiols
In this paper we report an efficient and mild procedure for the conversion of organic thiocyanates to thiols in the presence of phosphoruspentasulfide (P2S5) in refluxing toluene. The method avoids the use of expensive and hazardous transition metals and harsh reducing agents, as required by reported methods, and provides an attractive alternative to the existing methods for the conversion of organic
Iron-Catalyzed Benzylation Reaction of Arenes with Benzyl Thiocyanates
作者:Jin-Heng Li、Ri-Yuan Tang、Xiao-Kang Guo、Dong-Yun Zhao、Xing-Guo Zhang、Chen-Liang Deng
DOI:10.1055/s-0031-1290343
日期:2012.3
A novel, regioselective protocol for the synthesis of diphenylmethane derivatives has been developed by using iron-catalyzed Friedel-Crafts reaction of arenes with benzyl thiocyanates. In the presence of FeBr3, a variety of benzyl thiocyanates underwent the reaction with arenes to selectively afford the corresponding diarylmethane derivatives in moderate to high yields.