Cu-Mediated Trifluoromethylation of Aromatic α-Diazo Esters with the Yagupolskii-Umemoto Reagent
作者:Xiao-Qian Hu、Jia-Bin Han、Cheng-Pan Zhang
DOI:10.1002/ejoc.201601196
日期:2017.1.10
Reductive trifluoromethylation of aromatic α-diazo esters at roomtemperature with the Yagupolskii–Umemoto reagent [Ph2SCF3][OTf]; (2a)} in DMF in the presence of excess CuCl gave a variety of α-trifluoromethyl arylacetates in up to 93 % yield. The prior reaction of 2a with CuCl before the addition of the α-diazo esters was imperative for the conversion. This initial reaction might pregenerate the
Regioselective Vinylation of Remote Unactivated C(sp<sup>3</sup>)−H Bonds: Access to Complex Fluoroalkylated Alkenes
作者:Shuo Wu、Xinxin Wu、Dongping Wang、Chen Zhu
DOI:10.1002/anie.201812927
日期:2019.1.28
particular functional group into aliphatic sites by direct activation of unreactive C−H bonds is of great synthetic value. Despite advances in radical‐mediated functionalization of C(sp3)−H bonds by a hydrogen‐atom transfer process, the site‐selective vinylation of remote C(sp3)−H bonds still remains underexplored. Reported herein is a new protocol for the regioselective vinylation of unactivatedC(sp3)−H
Metal-Free Difluoromethylthiolation, Trifluoromethylthiolation, and Perfluoroalkylthiolation with Sodium Difluoromethane- sulfinate, Sodium Trifluoromethanesulfinate or Sodium Perfluoro- alkanesulfinate
A method for direct difluoromethylthiolation of Ar−H bonds is introduced. The stable and easy-to-handle HCF2SO2Na is reduced with (EtO)2P(O)H in the presence of TMSCl to generate HCF2S+ for the regioselective difluoromethylthiolation of aromatic compounds including indoles, pyrroles, and activated benzenes. This method is also applicable for the trifluoromethylthiolation with CF3SO2Na and the perf
介绍了一种直接的二氟甲硫基化Ar-H键的方法。在TMSCl存在下,用(EtO)2 P(O)H还原稳定易处理的HCF 2 SO 2 Na ,生成HCF 2 S +,用于芳香族化合物(包括吲哚,吡咯和活化)的区域选择性二氟甲基硫醇化反应苯。该方法也适用于用芳烃和杂芳烃用CF 3 SO 2 Na进行三氟甲基硫醇化和用R f SO 2 Na进行全氟烷基硫醇化。还讨论了与无金属亲电性氟代烷基硫基化反应相关的反应机理。
Pd-catalyzed Suzuki–Miyaura cross-coupling of [Ph 2 SR][OTf] with arylboronic acids
The Pd-catalyzed Suzuki–Miyaura cross-coupling of alkyl- and fluoroalkyl(diphenyl)sulfonium triflates with arylboronicacids was compared. The fluorine substitution on the alkyl groups of [Ph2SR][OTf] had a big influence on the reaction. Perfluoroalkyl(diphenyl)sulfonium triflates (2b–d) were unsuccessful participants in the Pd-catalyzed phenylation of arylboronicacid under the standard conditions because
比较了Pd催化的三氟甲基磺酸烷基酯和氟代烷基(二苯基)ulf与芳基硼酸的Suzuki-Miyaura交叉偶联。[Ph 2 SR] [OTf]烷基上的氟取代对反应有很大影响。在标准条件下,全氟烷基(二苯基)ulf三氟甲磺酸酯(2b–d)未能成功地参与Pd催化的芳基硼酸的苯基化反应,因为长链全氟烷基具有很强的负电性,而是经S R fn键断裂。多氟烷基三苯二氟es(2f–h)与芳基硼酸反应,由于de盐的去质子化和β-F消除的趋势,以非常低的收率得到苯基化产物。最终,发现(2,2,2-三氟乙基)三氟甲磺酸二苯基s(2e),三氟甲磺酸甲基或乙基(二苯基)i(2i或2j)和三氟甲磺酸三苯基s(2m)是比其他测试过的苯基硫salts盐更有效的试剂钯催化的苯基化反应,在温和条件下可提供更高的所需产物收率。
One-pot synthesis of trifluoromethyl amines and perfluoroalkyl amines with CF<sub>3</sub>SO<sub>2</sub>Na and R<sub>f</sub>SO<sub>2</sub>Na
作者:Shuaishuai Liang、Jingjing Wei、Lvqi Jiang、Jie Liu、Yasir Mumtaz、Wenbin Yi
DOI:10.1039/c9cc03282g
日期:——
A newly developed CF3SO2Na-based trifluoromethylation of secondary amines has been disclosed, and the method has been successfully extended to the configuration of perfluoroalkyl amines using RfSO2Na, complementing the established synthesis strategy of trifluoromethyl amines. Advantages of the method include good functional group tolerance, mild conditions, and inexpensive or easy-to-handle materials
已经公开了新开发的基于仲胺的基于CF 3 SO 2 Na的三氟甲基化,并且该方法已经成功地扩展到使用R f SO 2 Na的全氟烷基胺的构型,补充了已建立的三氟甲基胺的合成策略。该方法的优点包括良好的官能团耐受性,温和的条件以及廉价或易于处理的材料。机理探针表明,原位形成的硫代羰基氟化物是反应中的关键中间体。