Cu-Catalyzed Synthesis of 3-Formyl Imidazo[1,2-<i>a</i>]pyridines and Imidazo[1,2-<i>a</i>]pyrimidines by Employing Ethyl Tertiary Amines as Carbon Sources
作者:Changqing Rao、Shaoyu Mai、Qiuling Song
DOI:10.1021/acs.orglett.7b02015
日期:2017.9.15
A highly efficient synthesis of 3-formyl imidazo[1,2-a]pyridine and imidazo[1,2-a]pyrimidine, under Cu-catalyzed aerobic oxidative conditions and by utilizing ethyl tertiary amines as carbon sources, is disclosed. A novel activation mode of ethyl tertiary amines in which simultaneous selective cleavage of C–C bond and C–N bond of ethyl group with molecular oxygen as terminal oxidant in this one-pot
公开了在Cu催化的需氧氧化条件下并利用乙基叔胺作为碳源的3-甲酰基咪唑并[1,2- a ]吡啶和咪唑并[1,2- a ]嘧啶的高效合成方法。首次报道了一种乙基叔胺的新型活化方式,其中在此一锅操作方案中首次报道了用分子氧作为末端氧化剂同时选择性地裂解乙基的C–C键和C–N键。该反应具有广泛的底物范围,良好的官能团耐受性以及多样化且有价值的产品。