Catalytic Dehydrogenative C–C Coupling by a Pincer-Ligated Iridium Complex
作者:Miles Wilklow-Marnell、Bo Li、Tian Zhou、Karsten Krogh-Jespersen、William W. Brennessel、Thomas J. Emge、Alan S. Goldman、William D. Jones
DOI:10.1021/jacs.7b03433
日期:2017.7.5
moderate to good yields, up to ca. 90% based on the disproportionation reaction. The results of DFT calculations and experiments with substituted styrenes indicate that the coupling proceeds via double C–H addition of a styrene molecule, at β-vinyl and ortho-aryl positions, to give an iridium(III) metalloindene intermediate; this intermediate then adds a β-vinyl C–H bond of a second styrene molecule before
A convenient methodology for the stereoselective synthesis of symmetrical (1 E,3 E)-1,4-diarylbuta-1,3-dienes based on palladium-catalyzed Suzuki-Miyaura cross-coupling reaction of (1 E,3 E)-1,4-diiodobuta-1,3-diene with arylboronic reagents is reported.
Chloroalkenes, important building blocks for cross-coupling reactions, are prepared in one step by the Suzuki reaction of 1,1-dichloroethylene and 1,2-dichloroethylene with alkenyl- and arylboronic acids. Under the proper reaction conditions, it is possible to obtain the monocoupling reaction to provide the corresponding chloroalkenes with good yields. This method represents an excellent route for