NiH‐Catalyzed Migratory Defluorinative Olefin Cross‐Coupling: Trifluoromethyl‐Substituted Alkenes as Acceptor Olefins to Form
<i>gem</i>
‐Difluoroalkenes
a NiH-catalyzed migratory defluorinative coupling between two electronically differentiated olefins. A broad range of unactivated donor olefins can be joined directly to acceptor olefins containing an electron-deficient trifluoromethyl substituent in both intra- and intermolecular fashion to form gem-difluoroalkenes. This migratory coupling shows both site- and chemoselectivity under mild conditions
A copper-catalyzed direct hydroxyphosphorylation of electron-deficient alkenes with H-phosphine oxides and dioxygen is reported. The present reaction, proceeds under mild reaction conditions with good functional group tolerance, affording the facile and efficient synthesis of various β-hydroxyphosphine oxides in a scaled-up manner with moderate to good yields.
δ‐unsaturated oximes with π‐acceptors including trifluoromethyl alkenes, 1‐trifluoromethyl‐1,3‐butadienes, gem‐difluoroalkenes, acrylates, and styrenes has been achieved which provides an efficient and mild approach to construct structurally diverse and highly functionalized pyrrolines with good functional group tolerance. Importantly, upon utilization of trifluoromethyl alkenes as the coupling partners, the
A General Synthesis of α-Trifluoromethylstyrenes through Palladium-Catalyzed Cross-Couplings with 1,1,1-Trifluoroacetone Tosylhydrazone
作者:Agustín Jiménez-Aquino、Juan A. Vega、Andrés A. Trabanco、Carlos Valdés
DOI:10.1002/adsc.201300994
日期:2014.3.24
1,1,1‐Trifluoroacetone tosylhydrazone is presented as a very convenient substrate for the palladium‐catalyzedcross‐coupling with aryl halides. Under the proper reaction conditions, 3,3,3‐trifluoromethylstyrenes – very valuable trifluoromethylated synthetic intermediates – are obtained with high yields. The reaction features a very wide scope, as the presence of most functional groups is tolerated
Efficient Decarboxylative/Defluorinative Alkylation for the Synthesis of
<scp>
<i>gem</i>
‐Difluoroalkenes
</scp>
through an
<scp>
S
<sub>N</sub>
2
</scp>
’‐Type Route
作者:Wei‐Long Xing、Jia‐Xin Wang、Ming‐Chen Fu、Yao Fu
DOI:10.1002/cjoc.202100709
日期:2022.2
An efficientdecarboxylative/defluorinativealkylation for synthesizing gem-difluoroalkenes is described, providing a general method for installation of the challenging alkyl fragments containing α-electron-withdrawing groups into α-trifluoromethyl alkenes. Mechanistic studies suggest that this process involves an SN2′-type synthetic route in the absence of transition-metal catalysts or photocatalysis
描述了一种用于合成偕二氟烯烃的有效脱羧/脱氟烷基化反应,为将含有 α-吸电子基团的具有挑战性的烷基片段安装到 α-三氟甲基烯烃中提供了一种通用方法。机理研究表明,该过程涉及在没有过渡金属催化剂或光催化的情况下的 S N 2' 型合成路线。此外,该协议可以很容易地扩大规模,并成功应用于生物活性分子的修饰,从而补充了获得结构通用的gem-二氟烯烃的方法。