Diverse Oxidative C(sp2)–N Bond Cleavages of Aromatic Fused Imidazoles for Synthesis of α-Ketoamides and N-(pyridin-2-yl)arylamides
摘要:
An efficient and chemoselective C(sp(2))-N bond cleavage of aromatic imidazo[1,2-a]pyridine molecules is developed. A broad scope of amide compounds such as alpha-ketoamides and N-(pyridin-2-yl)arylamides are afforded as the final products in up to quantitative yields. Diverse C-N bond cleavages are controlled by the oxidative species used in this transformation, with various amide products afforded in a chemoselective fashion. A preliminary study indicated that some alpha-ketoamides exhibit anti-Tobacco Mosaic Virus activity for potential use in plant protection.
In this research, greensynthesis of imidazo[1,2-a]pyridines in the presence of calix[n]arenes-SO3H as a Brønsted acid catalyst and surfactant is described. Using of calix[n]arenes in water provided a hydrophobic cavity that successfully carried out the synthesis reactions at short times with high yields. This catalyst system is recoverable with a simple extraction using an organic solvent and reusable
在这项研究中,描述了在杯[ n ]芳烃-SO 3 H作为布朗斯台德酸催化剂和表面活性剂的存在下绿色合成咪唑并[1,2- a ]吡啶。在水中使用杯芳烃[ n ]芳烃提供了疏水腔,该腔在短时间内成功地以高收率成功地进行了合成反应。该催化剂体系可通过使用有机溶剂的简单萃取而回收,并且可重复使用至少5个循环而不会损失其活性。
Visible-light-activated C–C and C–N bond formation in the synthesis of imidazo[1,2-<i>a</i>]pyridines and imidazo[2,1-<i>b</i>]thiazoles under catalyst and solvent-free conditions
作者:Km Neha Shivhare、Manish K. Jaiswal、Anushree Srivastava、Saurabh K. Tiwari、I. R. Siddiqui
DOI:10.1039/c8nj03339k
日期:——
Synthesis of 3-aminoimidazo-fused heterocycles via the Groebke–Blackburn–Bienaymé reaction using a universally available energy source under catalyst and solvent-free conditions.
A facile protocol for the synthesis of 3-aminoimidazo-fused heterocycles via the Groebke–Blackburn–Bienayme reaction under catalyst-free and solvent-free conditions
作者:Shinde Vidyacharan、Anand H. Shinde、Bishnupada Satpathi、Duddu S. Sharada
DOI:10.1039/c3gc42130a
日期:——
A one-pot catalyst, solvent, work-up and column free synthesis of 3-aminoimidazo-fused heterocycles by a three-component reaction of a 2-aminoheterocycle, aldehyde, and isocyanide is presented. This efficient and green protocol has the advantages of environmental friendliness, high yields and operational simplicity.
Structure–Activity Relationships in Human Toll-like Receptor 8-Active 2,3-Diamino-furo[2,3-<i>c</i>]pyridines
作者:Deepak B. Salunke、Euna Yoo、Nikunj M. Shukla、Rajalakshmi Balakrishna、Subbalakshmi S. Malladi、Katelyn J. Serafin、Victor W. Day、Xinkun Wang、Sunil A. David
DOI:10.1021/jm301066h
日期:2012.9.27
hypothesized that the imidazo[1,2-a]pyrazines, readily accessible via the Groebke–Blackburn–Bienaymé multicomponent reaction, would possess sufficient structural similarity with TLR7/8-agonistic imidazoquinolines. With pyridoxal as the aldehyde component, furo[2,3-c]pyridines, rather than the expected imidazo[1,2-a]pyridines, were obtained, which were characterized by NMRspectroscopy and crystallography. Several
在我们不断寻找新的和合成上更简单的候选疫苗佐剂的过程中,我们假设咪唑并[1,2- a ]吡嗪可通过 Groebke-Blackburn-Bienaymé 多组分反应轻松获得,与 TLR7/8- 具有足够的结构相似性。激动剂咪唑并喹啉。以吡哆醛为醛组分,得到呋喃[2,3- c ]吡啶,而不是预期的咪唑并[1,2- a ]吡啶,通过NMR光谱和晶体学对其进行表征。发现几种类似物可激活 TLR8 依赖性 NF-κB 信号传导。在一个聚焦的呋喃 [2,3- c ] 吡啶库中,观察到不同的 C2 取代基具有明显的 SAR。在人类 PBMC 中,没有 furo[2,3-c ]吡啶显示任何促炎细胞因子诱导但上调几个趋化因子配体基因。在兔子的免疫研究中,活性最强的化合物显示出显着的辅助作用。完全缺乏促炎细胞因子诱导,加上新型呋喃 [2,3- c ] 吡啶的强佐剂活性,使这种迄今未知的化学型成为有吸引力的一类化合物,预计没有局部或全身反应原性。
Microwave-accelerated three-component condensation reaction on clay: solvent-free synthesis of imidazo[1,2-a] annulated pyridines, pyrazines and pyrimidines
作者:Rajender S. Varma、Dalip Kumar
DOI:10.1016/s0040-4039(99)01585-3
日期:1999.10
A rapid one-pot synthesis of imidazo[1,2-a] annulated pyridines, pyrazines and pyrimidines is described that occurs in the presence of recyclable montmorillonite K 10 clayundersolvent-freeconditions using microwaveirradiation.
描述了咪唑并[1,2- a ]环化吡啶,吡嗪和嘧啶的快速一锅合成,该反应在可回收的蒙脱土K 10粘土存在下,无溶剂条件下使用微波辐射进行。