Functionalization of Styrenes by Copper-Catalyzed Borylation/ ortho-Cyanation and Silver-Catalyzed Annulation Processes
Dr. Wanxiang Zhao
Department of Chemistry, University of Michigan, 930 N. University Ave, Ann Arbor, MI 48109-1055 (USA) http://www.umich.edu/∼jmgroup
Search for more papers by this authorCorresponding Author
Prof. John Montgomery
Department of Chemistry, University of Michigan, 930 N. University Ave, Ann Arbor, MI 48109-1055 (USA) http://www.umich.edu/∼jmgroup
Department of Chemistry, University of Michigan, 930 N. University Ave, Ann Arbor, MI 48109-1055 (USA) http://www.umich.edu/∼jmgroupSearch for more papers by this authorDr. Wanxiang Zhao
Department of Chemistry, University of Michigan, 930 N. University Ave, Ann Arbor, MI 48109-1055 (USA) http://www.umich.edu/∼jmgroup
Search for more papers by this authorCorresponding Author
Prof. John Montgomery
Department of Chemistry, University of Michigan, 930 N. University Ave, Ann Arbor, MI 48109-1055 (USA) http://www.umich.edu/∼jmgroup
Department of Chemistry, University of Michigan, 930 N. University Ave, Ann Arbor, MI 48109-1055 (USA) http://www.umich.edu/∼jmgroupSearch for more papers by this authorAbstract
An efficient two-step method for the assembly of indanone derivatives starting from a simple vinyl arene has been developed. The sequence first involves addition of bis(pinacolato)diboron (B2pin2) and N-cyano-N-phenyl-p-methylbenzenesulfonamide (NCTS) to a broad range of styrenes by utilizing IMesCuCl as catalyst. This step simultaneously accomplishes hydroboration of the alkene and ortho cyanation of the benzene unit. The products thus obtained are further functionalized by a AgNO3/Selectfluor-mediated coupling of the BPin and cyano functionalities to annulate a new five-membered ring. This combined two-step sequence provides a versatile method for the site-selective derivatization of a broad range of vinyl arene substrates.
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