Metal-free C–H arylation of imidazoheterocycles with aryl hydrazines
作者:Sourav Jana、Sadhanendu Samanta、Avik K. Bagdi、Valerii Z. Shirinian、Alakananda Hajra
DOI:10.1039/c8ra01474d
日期:——
A simple and efficient metal-freearylation of imidazo[1,2-a]pyridines at the C-3 position with arylhydrazine has been achieved at room temperature under ambient air conditions. Various 2,3-disubstituted imidazopyridines and imidazothiazoles were synthesized with high yields. The present methodology demonstrates the usefulness of commercially available aryl hydrazine as an arylating agent.
在室温和环境空气条件下,已经实现了在 C-3 位的咪唑并[1,2- a ]吡啶与芳基肼的简单有效的无金属芳基化。以高产率合成了各种 2,3-二取代的咪唑并吡啶和咪唑噻唑。本方法证明了可商购的芳基肼作为芳基化剂的有用性。
Straightforward Synthesis of Various 2,3-Diarylimidazo[1,2-<i>a</i>]pyridines in PEG<sub>400</sub>Medium through One-Pot Condensation and C-H Arylation
PEG400 is described herein as a suitable medium for the condensation of various 2-amino pyridines with α-bromo ketones. 2-Arylimidazo[1,2-a]pyridines were synthetized in a short time through microwave irradiation in moderate to excellent yields. After optimization, a convenient one-pot process enabled access to 2,3-diarylimidazo[1,2-a]pyridines by using a reduced amount of palladium catalyst without
AbstractAn efficient and economic Ag-catalyzed method for the direct cross-coupling of unactivated imidazo[1,2-a]pyridines with arylboronic acids has been developed. This approach leads to the formation of corresponding 2,3-diarylimidazo[1,2-a]pyridine derivatives as biological and pharmaceutical materials of interest in good yields under mild reaction conditions. Graphical abstract
摘要已开发出一种有效且经济的Ag催化方法,用于将未活化的咪唑并[1,2- a ]吡啶与芳基硼酸直接交叉偶联。该方法导致在温和的反应条件下以高收率形成相应的2,3-二芳基咪唑并[1,2- a ]吡啶衍生物,作为感兴趣的生物和制药材料。 图形概要
Cobalt-Catalyzed Direct Arylation of Imidazo[1,2-<i>a</i>
]pyridine with Aryl Iodides
作者:Dattatraya A. Babar、Haridas B. Rode
DOI:10.1002/ejoc.202000006
日期:2020.3.31
A practical protocol for the C‐3 arylation of imidazo[1,2‐a]pyridines with aryl/heteroaryl iodides using CoIICl2·6H2O is reported. The reaction can be performed in a Screw‐top V‐Vial® to expedite the synthesis.
报道了使用Co II Cl 2 · 6H 2 O将咪唑并[1,2- a ]吡啶与芳基/杂芳基碘化物进行C-3芳基化的实用协议。可以在Screw-topV-Vial®中进行反应,以加快合成速度。
One-step synthesis of imidazo[1,2-a]pyridines in water
作者:H. Zali-Boeini、N. Norastehfar、H. Amiri Rudbari
DOI:10.1039/c6ra17065j
日期:——
A novel straightforward method for the synthesis of 2,3-disubstituted imidazo[1,2-a]pyridine derivatives in water as a truly safe and cheap reaction medium was developed. Hence, N-alkyl pyridinium and S-alkyl thiouronium salts were reacted in the presence of NaHCO3 as a mild base in water to produce imidazo[1,2-a]pyridines in moderate to excellent yields.
开发了一种新颖的直接方法,用于在水中合成2,3-二取代的咪唑并[1,2- a ]吡啶衍生物,将其作为一种真正安全且廉价的反应介质。因此,使N-烷基吡啶鎓盐和S-烷基硫代铀盐在水中作为弱碱的NaHCO 3存在下反应,以中等至优异的产率生产咪唑并[1,2- a ]吡啶。