HECK REACTIONS IN 2,6-DIARYL-3,5-DIBROMO-4-PYRONES IN THE PRESENCE OF N,N '-DIBUTYLBENZIMIDAZOLIUM BROMIDE

[摘要]：Synthesis of two 2,6-diaryl-3,5-dibromo-4-pyrone derivatives is described, by using of NBS/DMF bromination of related 2,6-diaryl-4-pyrones. PdCl2 catalyzed Heck coupling reactions of these dibromides, with emphasis on the use of N,N'-dibutylbenzimidazol-2-ylidene as ligand, resulted in the formation of two class of mono- and di-vinylated products.

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