A visible-light-promoted cross-dehydrogenative-coupling reaction of N -arylglycine esters with imidazo[1,2- a ]pyridines
作者:Zhi-Qiang Zhu、Li-Jin Xiao、Chun-Cheng Zhou、Han-Lin Song、Zong-Bo Xie、Zhang-Gao Le
DOI:10.1016/j.tetlet.2018.07.047
日期:2018.8
cross-dehydrogenative-coupling reaction between N-arylglycine esters and imidazo[1,2-a]pyridines for the construction of CC bond was developed. A range of N-arylglycine esters and imidazo[1,2-a]pyridines were able to undergo the CDC reaction readily to afford α-heteroaryl substituted α-amino acid derivatives in good to excellent yields. A tentative mechanism for the photoredox reaction was also proposed. Importantly
N-芳基甘氨酸酯与咪唑并[1,2- a ]吡啶之间温和方便的可见光促进的交叉脱氢偶联反应被用于构建C C键。一系列的N-芳基甘氨酸酯和咪唑并[1,2- a ]吡啶能够很容易地进行CDC反应,从而以良好或优异的收率得到α-杂芳基取代的α-氨基酸衍生物。还提出了光氧化还原反应的初步机制。重要的是,在这种可见光促进的转化中使用铜(II)盐作为唯一催化剂使该反应可持续且实用。