与之前报道的在 C-5 中心功能化咪唑并[1,2- a ]吡啶的自由基途径相比,指导基团方法很少见。在此,我们展示了一种铑( III )催化的高效和区域选择性策略,用于使用N-甲氧基酰胺作为定向基团对咪唑并[1,2- a ]吡啶进行定向C-5官能化。该方法有利于定向芳基化,无需预功能化。它还允许进行克级合成和后功能化。
Microwave Assisted Synthesis of Disubstituted Imidazo[1,2-a]pyridine-3-carboxylic Acid Esters
摘要:
A novel and efficient synthetic method leveraging microwave-assisted organic synthesis (MAOS) to prepare disubstituted imidazo[1,2-a]pyridine-3-carboxylic acid esters (IPCEs) (3a-z), the key intermediates for a class of novel anti-tuberculosis agents, is reported. Under microwave heating at 120 degrees C for 20 or 30 min, the condensations of 2-aminopyridines (1a-k) and ethyl 2-halogenated acetoacetates (2a-d) were conveniently performed in ethanol with acceptable yields.
A series of N-(2-phenoxy)ethyl imidazo[1,2-a]pyridine-3-carboxamides (IPAs), based on the structure of WZY02 discovered in our lab, were designed and synthesized as new anti-TB agents. Results reveal that many of them exhibit excellent in vitro inhibitory activity with low nanomolar MIC values against both drug-sensitive MTB strain H37Rv and drug-resistant clinical isolates. Compounds 15b and 15d display
根据在我们实验室中发现的WZY02的结构,设计并合成了一系列N-(2-苯氧基)乙基咪唑并[1,2 - a ]吡啶-3-甲酰胺(IPAs),作为新型抗结核药物。结果表明,它们中的许多对药物敏感性MTB菌株H37Rv和耐药性临床分离株均表现出优异的体外抑制活性,且纳摩尔摩尔MIC值低。化合物15b和15d显示出良好的安全性和药代动力学特征,表明它们有望成为未来抗结核药物发现的先导化合物。
Design, synthesis, and biological evaluation of novel imidazo[
<i>1,2‐a</i>
]pyridinecarboxamides as potent anti‐tuberculosis agents
作者:Oluseye K. Onajole、Shichun Lun、Young Ju Yun、Damkam Y. Langue、Michelle Jaskula‐Dybka、Adrian Flores、Eriel Frazier、Ashle C. Scurry、Ambernice Zavala、Karen R. Arreola、Bryce Pierzchalski、A. Jean‐Luc Ayitou、William R. Bishai
DOI:10.1111/cbdd.13739
日期:2020.12
Tuberculosis (TB) is a highly infectious disease that has been plaguing the human race for centuries. The emergence of multidrug‐resistant strains of TB has been detrimental to the fight against tuberculosis with very few safe therapeutic options available. As part of an ongoing effort to identify potent anti‐tuberculosis agents, we synthesized and screened a series of novel imidazo[1,2‐a ]pyridinecarboxamide
A novel and efficient synthetic method leveraging microwave-assisted organic synthesis (MAOS) to prepare disubstituted imidazo[1,2-a]pyridine-3-carboxylic acid esters (IPCEs) (3a-z), the key intermediates for a class of novel anti-tuberculosis agents, is reported. Under microwave heating at 120 degrees C for 20 or 30 min, the condensations of 2-aminopyridines (1a-k) and ethyl 2-halogenated acetoacetates (2a-d) were conveniently performed in ethanol with acceptable yields.
10.1039/d4ob01166j
作者:Jahan, Kousar、Sood, Mehak、Jain, Osheen、Sahoo, Subash C.、Bharatam, Prasad V.
DOI:10.1039/d4ob01166j
日期:——
In contrast to previously reported free-radical pathways to functionalize imidazo[1,2-a]pyridines at the C-5 centre, directing group approaches are rare. Herein, we demonstrate a rhodium(III) catalyzed efficient and regioselective strategy for directed C-5 functionalization of imidazo[1,2-a]pyridines using N-methoxyamide as a directing group. This methodology facilitates directed arylation without
与之前报道的在 C-5 中心功能化咪唑并[1,2- a ]吡啶的自由基途径相比,指导基团方法很少见。在此,我们展示了一种铑( III )催化的高效和区域选择性策略,用于使用N-甲氧基酰胺作为定向基团对咪唑并[1,2- a ]吡啶进行定向C-5官能化。该方法有利于定向芳基化,无需预功能化。它还允许进行克级合成和后功能化。