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.
Iodotrifluoromethylation of Alkenes and Alkynes with Sodium Trifluoromethanesulfinate and Iodine Pentoxide
作者:Zhaojia Hang、Zejiang Li、Zhong-Quan Liu
DOI:10.1021/ol501380e
日期:2014.7.18
A scalable, selective, and operationally easy iodotrifluoromethylation of a wide range of alkenes and alkynes by using two simple and safe solids, sodiumtrifluoromethanesulfinate and iodine pentoxide, in aqueous medium has been developed. Mechanistic studies confirm that free-radical processes are involved in this system since the key radical intermediates such as CF3 and β-CF3 alkyl radicals have
Stereoselective cobalt-catalyzed halofluoroalkylation of alkynes
作者:Guojiao Wu、Axel Jacobi von Wangelin
DOI:10.1039/c7sc04916a
日期:——
Stereoselective additions of highly functionalized reagents to available unsaturated hydrocarbons are an attractive synthetic tool due to their high atom economy, modularity, and rapid generation of complexity. We report efficient cobalt-catalyzed (E)-halofluoroalkylations of alkynes/alkenes that enable the construction of densely functionalized, stereodefined fluorinated hydrocarbons. The mild conditions
The Different Faces of Photoredox Catalysts: Visible-Light-Mediated Atom Transfer Radical Addition (ATRA) Reactions of Perfluoroalkyl Iodides with Styrenes and Phenylacetylenes
作者:Thomas Rawner、Eugen Lutsker、Christian A. Kaiser、Oliver Reiser
DOI:10.1021/acscatal.8b00847
日期:2018.5.4
phenylacetylenes using readily available copper phenanthroline catalyst is reported. In contrast to commonly employed [Ru(bpy)3]Cl2, [Ru(phen)3]Cl2 or fac-Ir(ppy)3, [Cu(dap)2]Cl is capable to convert styrenes to the corresponding perfluoroalkyl tagged ethylbenzenes, pointing toward an additional role of the copper catalyst beyond photoinduced electron transfer. An inner sphere catalytic cycle involving Cu(III)
A New and Improved Synthesis of <i>trans</i>-1,2-Diiodoalkenes and Their Stereospecific and Highly Regioselective Trifluoromethylation
作者:Jianxin Duan、William R. Dolbier,、Qing-Yun Chen
DOI:10.1021/jo9816663
日期:1998.12.1
Reaction of terminal alkynes with iodine in the presence of CuI (5%) in acetonitrile under reflux for several hours gave the trans-1,2-diiodoalkenes in high yields. The trifluoromethylation of these diiodides using FSO2CF2CO2Me/CuI/DMF proceeded in excellent yields in a stereospecific and highly regioselective manner.