highly selective C-2 difluoromethylation of indole derivatives was developed by using sodium difluoromethylsulfinate (HCF2SO2Na) as the source of difluoromethyl groups and a Cu(II) complex as the catalyst. Various substrates were well tolerated in this transformation and the desired products were obtained in moderate to good yields. Moreover, the late-stage C-2 difluoromethylation of bioactive molecules
通过使用二氟甲基亚磺酸钠(HCF 2 SO 2 Na)作为二氟甲基的来源和Cu(II)络合物作为催化剂,开发了一种新颖且高效的吲哚衍生物高选择性C-2二氟甲基化方法。在这种转化中,各种底物都具有良好的耐受性,并且以中等至良好的产率获得了所需的产物。此外,以高收率实现了含有吲哚环的生物活性分子的后期C-2二氟甲基化。通常,该反应具有出色的官能团相容性,广泛的底物范围和出色的C-2选择性。
Free-Radical-Promoted Copper-Catalyzed Intermolecular Cyanosulfonylation and Cyanotrifluoromethylation of Unactivated Alkenes in Water-Containing Solvents
作者:Yan Zhu、Jinlong Tian、Xianfeng Gu、Yonghui Wang
DOI:10.1021/acs.joc.8b02073
日期:2018.11.2
A novel and practical copper-catalyzed strategy for intermolecular cyanosulfonylation and cyanotrifluoromethylation of unactivated alkenes in water-containing solvents is described. The methodology developed provides an efficient and convenientaccess to a variety of β-sulfonyl nitriles and β-trifluoromethyl nitriles, which would have wide applications in chemical and pharmaceutical industries.
alcohol and amine derivatives catalyzed by 2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN) was developed. This reaction delivered δ-fluoromethylated free alcohols and amines with in situ deprotection of benzyl protecting group under mild irradiation conditions. 4CzIPN was found to be a competent metal-free photoredox catalyst for activating several types of fluoromethylation reagents including
开发了由2,4,5,6-四(9 H-咔唑-9-基)间苯二甲腈(4CzIPN)催化的苄基保护的均丙醇和胺衍生物的加氢三氟甲基化。该反应递送δ-氟甲基化的游离醇和胺,并在温和的辐射条件下原位去保护苄基保护基。已发现4CzIPN是一种有效的无金属光氧化还原催化剂,可通过氧化猝灭活化CF 3 SO 2 Cl,Togni试剂和2-溴-2,2-二氟乙酸酯,以及通过CF 3 SO 2 Na活化几种类型的氟甲基化试剂。还原淬灭,以使简单的烯烃和迈克尔受体直接进行氢三氟甲基化。
Copper-Mediated Di- and Monofluoromethanesulfonylation of Arenediazonium Tetrafluoroborates: Probing the Fluorine Effect
作者:Bo Xing、Chuanfa Ni、Jinbo Hu
DOI:10.1002/cjoc.201700748
日期:2018.3
A copper‐mediated di‐ and monofluoromethanesulfonylation of arenediazoniumtetrafluoroborates using di‐ and monofluoromethanesulfinate reagents provides aryl difluoromethyl (or monofluoromethyl) sulfones in good yields. It was found that the relative reactivity of these sodium fluoroalkanesulfinates in the present reactions decreases in the following order: CH2FSO2Na > CF2HSO2Na > CF3SO2Na.
The catalyst-free electrochemical di- and trifluoromethylation/cyclization of N-substituted acrylamides was realized under external oxidant-free conditions. The strategy provides expedient access to fluoroalkylated oxindoles and 3,4-dihydroquinolin-2(1H)-ones with ample scope and broad functional group tolerance by mild, direct electrolysis of sodium sulfinates in an undivided cell. Detailed mechanistic