<i>Z</i>-Selective Olefin Synthesis via Iron-Catalyzed Reductive Coupling of Alkyl Halides with Terminal Arylalkynes
作者:Chi Wai Cheung、Fedor E. Zhurkin、Xile Hu
DOI:10.1021/jacs.5b01784
日期:2015.4.22
Selective catalytic synthesis of Z-olefins has been challenging. Here we describe a method to produce 1,2-disubstituted olefins in high Z selectivity via reductive cross-coupling of alkylhalides with terminal arylalkynes. The method employs inexpensive and nontoxic catalyst (iron(II) bromide) and reductant (zinc). The substrate scope encompasses primary, secondary, and tertiaryalkylhalides, and
Stereospecific Alkenylation of C−H Bonds via Reaction with β-Heteroatom-Functionalized Trisubstituted Vinyl Triflones<sup>1</sup>
作者:Jason Xiang、Wanlong Jiang、Jianchun Gong、P. L. Fuchs
DOI:10.1021/ja963636s
日期:1997.5.1
Aryl and alkyl β-heteroatom-trisubstituted vinyltriflones react with THF and cyclohexane to undergo trifluoromethyl radical-mediated C−H functionalization reactions to afford E and Z β-heteroatom-trisubstituted olefins. Most reactions proceed with both high yield and high stereospecificity (retention of configuration). β-Substituents which have been employed in this study are iodine, bromine, fluorine
芳基和烷基 β-杂原子三取代乙烯基三氟乙烯与四氢呋喃和环己烷反应,进行三氟甲基自由基介导的 CH 官能化反应,得到 E 和 Z β-杂原子三取代烯烃。大多数反应以高产率和高立体特异性(构型保留)进行。本研究中使用的β-取代基是碘、溴、氟、苯甲酸酯、碳酸乙酯和邻苯二甲酰亚胺。带有强大电子释放基团(如烷氧基或氨基)的 β-取代基使乙烯基三氟乙烯失去反应性。
ICHINOSE, Y.;MATSUNAGA, SH.;FUGAMI, K., TETRAHEDRON LETT., 30,(1989) N4, C. 3155-3158