the three-component reaction of arenediazonium tetrafluoroborates, Na2S2O5, and N-fluorobenzenesulfonimide (NFSI). The reaction proceeds through a radical tandem process, affording various arenesulfonylfluorides in moderate to high yields. This protocol not only provides a complement to the previous fluorosulfonylation reactions, but also extends the applications of Sandmeyer reaction.
通过四氟硼酸壬二唑鎓,Na 2 S 2 O 5和N-氟苯磺酰亚胺(NFSI)的三组分反应,实现了无过渡金属的Sandmeyer型氟磺酰化反应。该反应通过自由基串联过程进行,以中等至高产率提供各种芳烃磺酰氟。该方案不仅为以前的氟磺酰化反应提供了补充,而且扩展了桑德迈尔反应的应用。
Pentafluoroethylation of Arenediazonium Tetrafluoroborates Using On‐Site Generated Tetrafluoroethylene
作者:Bo Xing、Lingchun Li、Chuanfa Ni、Jinbo Hu
DOI:10.1002/cjoc.201900268
日期:2019.11
Copper‐mediated pentafluoroethylation of arenediazonium tetrafluoroborates with tetrafluoroethylene (TFE) on‐site generated from TMSCF3 has been developed as a new method to prepare pentafluoroethyl arenes. The active pentafluoroethylation reagent “CuC2F5” is pre‐generated from CuSCN, TFE and CsF, and its generation and further reaction are strongly solvent‐dependent. This pentafluoroethylation reaction
已经开发了由TMSCF 3现场产生的四氟硼酸芳族二唑鎓与四氟乙烯(TFE)的铜介导的五氟乙基化,这是制备五氟乙基芳烃的一种新方法。活性五氟乙基化试剂“ CuC 2 F 5 ”是由CuSCN,TFE和CsF预先生成的,其生成和进一步的反应强烈依赖于溶剂。该五氟乙基化反应代表了Sandmeyer型五氟乙基化的第一个例子,它具有良好的官能团耐受性,并且在合成复杂的生物活性化合物方面具有潜在的应用价值。
Practical Reagents and Methods for Nucleophilic and Electrophilic Phosphorothiolations
作者:Szabolcs Kovács、Bilguun Bayarmagnai、Alexandre Aillerie、Lukas J. Gooßen
DOI:10.1002/adsc.201701549
日期:2018.5.16
using nucleophilic and electrophilicreagents. The nucleophilic reagent, tetramethylammonium O,O‐dimethyl phosphorothioate, was synthesized in near‐quantitative yield from Me3SiP(O)(OMe)2, elemental sulfur and Me4NF. Its umpolung with N‐bromophthalimide provided the electrophilicreagent, O,O‐dimethyl‐S‐(N‐phthalimido)phosphorothioate. Complementary methods based on these reagents enable the phosphorothiolation
Mild and selective base-free C–H arylation of heteroarenes: experiment and computation
作者:Hannes P. L. Gemoets、Indrek Kalvet、Alexander V. Nyuchev、Nico Erdmann、Volker Hessel、Franziska Schoenebeck、Timothy Noël
DOI:10.1039/c6sc02595a
日期:——
A mild and selective C–Harylation strategy for indoles, benzofurans and benzothiophenes is described. The arylation method engages aryldiazonium salts as arylating reagents in equimolar amounts. The protocol is operationally simple, base free, moisture tolerant and air tolerant. It utilizes low palladium loadings (0.5 to 2.0 mol% Pd), short reaction times, green solvents (EtOAc/2-MeTHF or MeOH) and
Sandmeyer trifluoromethylthiolation of arenediazonium salts with sodium thiocyanate and Ruppert–Prakash reagent
作者:Grégory Danoun、Bilguun Bayarmagnai、Matthias F. Gruenberg、Lukas J. Goossen
DOI:10.1039/c3sc53076k
日期:——
sodium thiocyanate and the inexpensive, easy-to-use trifluoromethylating reagent Me3Si–CF3, diazoniumsalts are smoothly converted into the corresponding aryl trifluoromethyl thioethers. Combined with diazotisation, this convenient and inexpensive method allows the straightforward synthesis of aryl or heteroaryl trifluoromethyl thioethers from the corresponding anilines.