Double Heck Cross-Coupling Reactions of Dibrominated Pyridines

[摘要]：Double Heck cross-coupling reactions of 2,3- and 3,5-dibromopyridine with various alkenes afforded the corresponding novel di(alkenyl)pyridines. The Heck reaction of 2,5-dibromopyridine unexpectedly afforded 5,5'-di(alkenyl)-2,2'-bipyridines by palladium-catalyzed dimerization to give 5.5'dibromo-2,2'-bipyridine and subsequent twofold Heck reaction.

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