Regio- and stereo-specific preparation of (E)-1-aryl-3,3,3-trifluoro-1-iodo-propenes and their palladium-catalyzed reaction with terminal alkynes
摘要:
A new type of iodo-containing trifluoromethylated building blocks were synthesized. The reaction of 1-aryl-3,3,3-trifluoropropynes 1 with lithium iodide in acetic acid at 75 degrees C gave (E)-1-aryl-3,3,3-trifluoro-1-iodo-propenes 2 in high yield, which undergo the palladium-catalyzed Sonogashira reaction with terminal alkynes afforded trifluoromethyl-containing 1,3-enynes in high yield. (c) 2008 Published by Elsevier B.V.
A novel Cu(I)/Ag(I)-mediated decarboxylative trifluoromethylation of arylpropiolic acids with Me3SiCF3 has been developed for the construction of Csp-CF3 bond under mild conditions. This method proceeds smoothly at room temperature and shows a widely functional compatibility, providing a series of corresponding trifluoromethylated acetylenyl-containing aromatics in good yields.
Copper-Mediated Aerobic Oxidative Trifluoromethylation of Terminal Alkynes with Me<sub>3</sub>SiCF<sub>3</sub>
作者:Lingling Chu、Feng-Ling Qing
DOI:10.1021/ja102175w
日期:2010.6.2
An efficient copper-mediated trifluoromethylation of terminalalkynes with nucleophilic trifluoromethylating reagent (Me(3)SiCF(3)) was developed. Both aromatic alkynes and aliphatic alkynes were effective, and a variety of functionalities such as amino, -OMe, -CO(2)Et, -Br, and -NO(2) were tolerated under the reaction conditions. This reaction provides a general, straightforward, and practically useful
A catalytic process for trifluoromethylation of terminalalkynes with Togni’s reagent has been developed, affording trifluoromethylated acetylenes in good to excellent yields. The reaction is conducted at room temperature and exhibits tolerance to a range of functional groups.
Diverse copper(<scp>iii</scp>) trifluoromethyl complexes with mono-, bi- and tridentate ligands and their versatile reactivity
作者:Song-Lin Zhang、Chang Xiao、Hai-Xing Wan
DOI:10.1039/c8dt00291f
日期:——
recombine with the CF3 radical. In contrast, 10, with octahedral geometry, is more rigid. Reactivity studies show that except for ion-pair complex 8, they are highly reactive for the trifluoromethylation of arylboronic acids and the C–H bond of terminal alkynes. Furthermore, syn-fluoro- and -oxy-trifluoromethylation across the triple bond of alkynes can be achieved using 6 and CsF or NaOPh. These results
铜(III)三氟甲基络合物被提议为许多铜促进的三氟甲基化反应的必要中间体,但仍然难以捉摸且很少被探索。我们在此报告了具有不同配位配体(单齿,双齿或三齿)和形式电荷(中性或单阴离子)的各种Cu III –CF 3配合物(6–10)的分离,光谱和X射线晶体学表征L(L是吡啶,2,4,6-三甲基吡啶,喹啉-8-环氧乙烷或2,6-双(2'-吡啶基)吡啶)。正方平面络合物6,7和9,由于弱的Cu-CF显示在溶液中的快速动态行为可能3可以迅速离解并与CF 3自由基复合的键。相反,具有八面体几何形状的10更具刚性。反应性研究表明,除离子对络合物8外,它们对芳基硼酸的三氟甲基化和末端炔烃的C–H键具有高反应性。此外,使用6和CsF或NaOPh可以实现跨越炔烃三键的顺-氟-和-氧基-三氟甲基化。这些结果大大扩展了分离和表征良好的Cu(III)–CF 3的范围 络合物,并建立其广泛的反应性,可能广泛参与铜介导
Practical Methods for the Synthesis of Trifluoromethylated Alkynes: Oxidative Trifluoromethylation of Copper Acetylides and Alkynes
Two practical and complementary methods are reported for the synthesis of trifluoromethylated alkynes. The first one, a mix‐and‐stir process, is based on the oxidative trifluoromethylation of readily available and bench‐stable copper acetylides while the second one, which displays a broad substrate scope and has several advantages over existing procedures, is based on the oxidativecopper‐catalyzed