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
A novel base-induced cyclization of selected benzyl alkynyl sulfides for the synthesis of 2-aryl-2,3-dihydrothiophenes
作者:Laura K McConachie、Adrian L Schwan
DOI:10.1016/s0040-4039(00)00916-3
日期:2000.7
2-Halobenzyl 1-alkynyl sulfides undergo an unprecedented dihydrothiophene formation when treated with 2 equiv. of KOtBu in CH3CN. The reaction, believed to proceed via a 5-endo-dig cyclization, is sluggish or non-existent in the absence of the halogen.
当用2当量处理时,2-卤代苄基1-炔基硫化物经历前所未有的二氢噻吩形成。CH 3 CN中KO t Bu的摩尔数。据信该反应是通过5-内挖-环化进行的,在没有卤素的情况下反应缓慢或不存在。
Synthesis of alkyl thiocyanates from alcohols using a polymer-supported thiocyanate ion promoted by cyanuric chloride/dimethylformamide
作者:Mohammad Ali Karimi Zarchi、Asmaosadat Tabatabaei Bafghi
DOI:10.1080/17415993.2015.1035273
日期:2015.7.4
convenient procedure for one-pot conversion of alcohols into the corresponding alkyl thiocyanates in the presence of cross-linked poly (N-propyl-4-vinylpyridinium) thiocyanateion [P4-VP]Pr-SCN, promoted by cyanuric chloride/dimethylformamide, is described. Various alcohols were converted to their corresponding alkyl thiocyanates and it was observed that substituted benzyl alcohol with electron-withdrawing
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.
Versatile Route to Functionalized 1<i>H-</i>2-Benzothiopyrans and 1<i>H-</i>2-Naphthothiopyrans by Electrophilic Cyclization of Bis(arylmethylthio)acetylenes: 2-Benzo- and 2-Naphthothiopyrylium Salts
作者:Thomas R. Klein、Marco Bergemann、Nasser A. M. Yehia、Egon Fanghänel
DOI:10.1021/jo972334l
日期:1998.7.1
Substituted 1H-2-benzothiopyrans find applications as pharmaceutically active compounds or synthons for more complex sulfur heterocycles. However, restricted variability in their synthesis limits the application for research or industrial purposes. To develop a direct and fast route to substituted and functionalized 1H-2-benzothiopyrans, we investigated the ring closure of symmetrical bis(arylmethylthio)acetylenes with iodine monochloride or bromine. This facile reaction yielded 1H-3-halo-4-arylmethylthio-2-benzo- and 2-naphthothiopyrans via postulated vinyl cations in yields of 47-86%. Substituted 2-benzo- and 2-naphthothiopyrylium salts were prepared by hydride abstraction with triphenylcarbenium tetrafluoroborate from the products, further enhancing the synthetic potential of the found cyclization reaction.