已经开发了N-融合的咪唑杂环的有效的区域选择性级联合成。这种级联转化是通过2-氨基苯并咪唑,醛和炔烃之间的过渡金属(铜/银)催化的偶联反应进行的,从而导致炔丙基胺中间体的形成,该中间体通过分子内的N–H键活化而选择性地进行6-内切-环化相互干扰的C–N键的形成导致高度官能化的咪唑并[1,2- a ]嘧啶的生成,收率良好至极佳。
Copper oxide nanoparticle catalysed synthesis of imidazo[1,2-a]pyrimidine derivatives, their optical properties and selective fluorescent sensor towards zinc ion
作者:Manish Rawat、Diwan S. Rawat
DOI:10.1016/j.tetlet.2018.05.005
日期:2018.6
biologically active fused imidazo[1,2-a]pyrimidines were achieved via A3 coupling involving 2-aminobenzimidazole, aldehyde and terminal alkyne, followed by 6-endo-dig cyclization using copper oxide nanoparticles under solvent free condition. Further optical properties of imidazo[1,2-a]pyrimidines were studied which showed the effect of electron-donating and electron-withdrawing substitution on the fluorescence
经由具有2-氨基苯并咪唑,醛和末端炔的A 3偶联,然后在无溶剂条件下使用氧化铜纳米颗粒进行6-内挖-环化,来合成具有生物活性的稠合的咪唑并[1,2- a ]嘧啶。研究了咪唑并[1,2- a ]嘧啶的其他光学性质,这些性质表明给电子和吸电子取代对这些化合物的荧光强度的影响。在20种化合物中,2,4-双(4-甲氧基苯基)苯并[4,5]咪唑并[1,2- a ]嘧啶可作为锌离子的荧光传感器,检出限为4.74μM,远低于世界卫生组织在饮用水中允许的最大锌浓度。
Regioselective Synthesis of Fused Imidazo[1,2-<i>a</i>]pyrimidines via Intramolecular C–N Bond Formation/6-<i>Endo-Dig</i> Cycloisomerization
作者:Atul Kumar、Mukesh Kumar、Shivam Maurya、Ranjana S. Khanna
DOI:10.1021/jo5007762
日期:2014.8.1
An efficient regioselective cascadesynthesis of N-fused imidazo heterocycles has been developed. This cascade transformation proceeds via a transition-metal (copper/silver) catalyzed coupling reaction between 2-aminobenzimidazole, aldehydes, and alkynes leading to the formation of propargylamine intermediate, which regioselectively undergoes 6-endo-dig cyclization through intramolecular N–H bond activation
已经开发了N-融合的咪唑杂环的有效的区域选择性级联合成。这种级联转化是通过2-氨基苯并咪唑,醛和炔烃之间的过渡金属(铜/银)催化的偶联反应进行的,从而导致炔丙基胺中间体的形成,该中间体通过分子内的N–H键活化而选择性地进行6-内切-环化相互干扰的C–N键的形成导致高度官能化的咪唑并[1,2- a ]嘧啶的生成,收率良好至极佳。