One-Pot Synthesis of Naphtho[1′,2′:4,5]imidazo[1,2-<i>a</i>
]pyridin-5-yl(aryl)methanones through Sequential Sonogashira Coupling/Alkyne-Carbonyl Metathesis
作者:Mirza Feroz Baig、Siddiq Pasha Shaik、Namballa Hari Krishna、Neeraj Kumar Chouhan、Abdullah Alarifi、Ahmed Kamal
DOI:10.1002/ejoc.201700496
日期:2017.7.25
An efficient one-pot route for the construction of naphtho[1′,2′:4,5]imidazo[1,2-a]pyridin-5-yl(aryl)methanones and 5-phenylnaphtho[1′,2′:4,5]imidazo[1,2-a]pyridines by sequential Sonogashira coupling reaction followed by trifluoroacetic acid promoted alkyne-carbonyl metathesis (ACM) has been developed. 2-(2-Bromophenyl)imidazo[1,2-a]pyridine-3-carbaldehyde preferentially underwent ACM with phenyl
One-Pot Cascade Reactions Leading to Pyrido[2′,1′:2,3]imidazo[4,5-<i>c</i>][1,2,3]triazolo[1,5-<i>a</i>]quinolines under Bimetallic Relay Catalysis with Air as the Oxidant
作者:Ze Wang、Bin Li、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.6b00996
日期:2016.8.5
3-triazole/quinoline-fused imidazo[1,2-a]pyridines starting from 2-(2-bromophenyl)imidazo[1,2-a]pyridines, alkynes, and sodium azide. This novel method involves a one-pot bimetallic relay-catalyzed cascade process combining azide–alkyne cycloaddition, C–N coupling between 1,2,3-triazole and aryl bromide, and intramolecular cross dehydrogenative C–C coupling between 1,2,3-triazole and imidazo[1,2-a]pyridine. Notable
在本文中,我们报道了1,2,3-三唑/喹啉稠合咪唑并的有效一锅合成[1,2一]从2-吡啶(2-溴苯基)咪唑并[1,2一]吡啶,炔烃和叠氮化钠。这种新方法涉及一锅双金属中继催化的级联过程,该过程结合了叠氮化物-炔烃的环加成反应,1,2,3-三唑与芳基溴化物之间的C–N偶联以及1,2,3之间的分子内交叉脱氢C–C偶联-三唑和咪唑并[1,2- a ]吡啶。该协议的显着特征包括简单的起始原料,可持续的氧化剂,减少的合成步骤和高效率。
Copper-Catalyzed Regioselective Cleavage of C−X and C−H Bonds: A Strategy for Sulfur Dioxide Fixation
作者:Daoshan Yang、Pengfei Sun、Wei Wei、Fengjuan Liu、Hui Zhang、Hua Wang
DOI:10.1002/chem.201705866
日期:2018.3.20
The first example of direct fixation of sulfur dioxide between heteroaryls and aryl halides has been developed via copper‐catalyzed regioselective cleavage of C−X and C−H bonds under base‐free and ligand‐free conditions by using DABSO (1,4‐diazabicyclo[2.2.2]octane bis(sulfur dioxide)) as a solid and bench‐stable sulfur dioxide surrogate. This mild protocol results in double C−S bond‐forming reactions
An efficient one-pot protocol has been developed using sequential C-N coupling and intramolecular dehydrogenativecross-couplings for the synthesis of azole fused imidazo[1,2-a]pyridine derivatives in good yields (62-78%).