Photoredox catalysis enabled alkylation of alkenyl carboxylic acids with N-(acyloxy)phthalimide via dual decarboxylation
作者:Kun Xu、Zhoumei Tan、Haonan Zhang、Juanli Liu、Sheng Zhang、Zhiqiang Wang
DOI:10.1039/c7cc05910h
日期:——
ruthenium based photoredox catalyst in combination with substoichiometric amount of 1,4-diazabicyclo[2.2.2]octane (DABCO) efficiently catalyzed dual decarboxylative couplings between alkenyl carboxylic acids and N-(acyloxy)phthalimides derived from aliphatic carboxylic acids, delivering alkylated styrene derivatives in a high regio- and stereo- selective manner under mild reaction conditions. Various types
钌基光氧化还原催化剂与亚化学计量的1,4-二氮杂双环[2.2.2]辛烷(DABCO)结合有效地催化了烯基羧酸与衍生自脂肪族羧酸的N-(酰氧基)邻苯二甲酰亚胺之间的双脱羧偶联,从而得到烷基化的苯乙烯在温和的反应条件下,以高区域和立体选择性的方式衍生衍生物。各种类型的仲,叔和季脂族羧酸以及α-氨基酸可用作合适的底物。机理分析表明,该反应通过Ru(I)/ Ru(II)催化循环介导的自由基机理进行,DABCO既充当碱,又充当单电子转移的助催化剂。