8-methyl-2-(p-tolyl)imidazo[1,2-a]pyridine

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: 8-methyl-2-(p-tolyl)imidazo[1,2-a]pyridine
• 英文别名: 8-methyl-2-(4-methylphenyl)imidazo[1,2-a]pyridine
• 化学式: C₁₅H₁₄N₂
• mdl: MFCD00444954
• 分子量: 222.29
• InChiKey: BBWDULJOEGZFPY-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.2
• 重原子数：
  17
• 可旋转键数：
  1
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.133
• 拓扑面积：
  17.3
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  8-methyl-2-(p-tolyl)imidazo[1,2-a]pyridine 在 copper(l) iodide 、 sodium azide 、 硫酸 、 盐酸羟胺 、 potassium carbonate 、 三氯氧磷 作用下， 以 乙醇 、 N,N-二甲基甲酰胺 为溶剂， 反应 26.0h， 生成 8-methyl-2-p-tolyl-imidazo[1,2-a]pyridine-3-carbaldehyde-O-[1-(4-methylbenzyl)-1H-1,2,3-triazol-4-yl]methyl oxime
  参考文献：
  名称：

  Facile synthesis of new imidazo[1,2-a]pyridines carrying 1,2,3-triazoles via click chemistry and their antiepileptic studies

  摘要：

  The present article reports the synthesis and anticonvulsant studies of new 2-arylimidazo[1,2-a]pyridines carrying suitably substituted 1,2,3-triazoles as well as their intermediates. The structures of newly synthesized compounds were confirmed by various spectroscopic techniques. The anticonvulsant study was carried out by MES and scPTZ screening methods, while their toxicity study was performed following Rotarod method. The active compounds showed enhanced seizure control in scPTZ method when compared with that of MES method. Compounds 3f, 4c, 4f, 5k, 5p and 5w carrying active pharmacophores exhibited complete protection against seizure and their results were comparable with standard drug diazepam. Majority of new compounds were found to be non-toxic, while few of them showed toxicity at 100 mg/kg. The c log P values of target compounds are in the range of 3.5-5.3, which confirm their lipophilic nature. (C) 2013 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.bmcl.2013.03.086
• 作为产物：
  描述：

  2-氨基-3-甲基吡啶 、 对甲基苯乙酮 在 copper(l) iodide 、 三氟化硼乙醚 、 氧气 作用下， 以 水 为溶剂， 反应 24.0h， 生成 8-methyl-2-(p-tolyl)imidazo[1,2-a]pyridine
  参考文献：
  名称：

  有机染料催化的可见光介导的咪唑并吡啶的区域选择性 C-3 烷氧基羰基化反应

  摘要：

  已开发出一种温和且环保的可见光介导的咪唑并[1,2- a ]吡啶杂环化合物的区域选择性 C-H 烷氧基羰基化反应，该反应在室温下使用玫瑰红作为光氧化还原催化剂。已经制备了 C-3 位具有重要生物学意义的烷氧基羧基化咪唑并 [1,2 - a ] 吡啶以及香豆素和喹喔啉-2(1 H )-酮。本方法的优点是具有用户友好和生态友好的催化剂、羰基源，以及由可见光作为绿色能源介导的直接和区域选择性 C-H 烷氧基羰基化的极其温和的条件。

  DOI：

  10.1021/acs.joc.2c01742

文献信息

• (Diacetoxy)iodobenzene-Mediated Oxidative C–H Amination of Imidazopyridines at Ambient Temperature
  作者：Susmita Mondal、Sadhanendu Samanta、Sourav Jana、Alakananda Hajra

  DOI：10.1021/acs.joc.7b00564

  日期：2017.4.21

  (Diacetoxy)iodobenzene (PIDA)-mediated direct oxidative C–H amination for the synthesis of 3-amino substituted imidazopyridines has been achieved under metal-free conditions at room temperature in short reaction times. This methodology is also applicable for the regioselective amination of indolizines. Experimental results suggest that the reaction likely proceeds through a radical pathway.

  在无金属条件下，室温下以较短的反应时间完成了由（二乙酰氧基）碘苯（PIDA）介导的直接氧化CH-H胺合成3-氨基取代的咪唑并吡啶。该方法学也适用于吲哚嗪的区域选择性胺化。实验结果表明该反应可能通过自由基途径进行。
• Mn(II)-Catalyzed C–H Alkylation of Imidazopyridines and <i>N</i>-Heteroarenes via Decarbonylative and Cross-Dehydrogenative Coupling
  作者：Sadhanendu Samanta、Alakananda Hajra

  DOI：10.1021/acs.joc.9b00366

  日期：2019.4.5

  A Mn(II)-catalyzed efficient C–H alkylation of imidazoheterocycles and N-heteroarenes with aliphatic aldehydes has been developed via oxidative decarbonylation. Other alkylating agents such as cyclic alkanes, ethers, and alcohols also coupled with N-heteroarenes through cross-dehydrogenative coupling. Regioselectively C5-alkylated imidazoheterocycles were synthesized in good yields. Experimental results

  锰（II）催化的咪唑杂环和N-杂芳烃与脂肪族醛的高效CH烷基化反应是通过氧化脱羰作用开发的。其他烷基化剂如环状烷烃，醚和醇也通过交叉脱氢偶联与N-杂芳烃偶联。区域选择性的C5-烷基化的咪唑杂环以高产率合成。实验结果表明自由基途径可能参与了该反应。
• A visible-light-promoted cross-dehydrogenative-coupling reaction of N -arylglycine esters with imidazo[1,2- a ]pyridines
  作者：Zhi-Qiang Zhu、Li-Jin Xiao、Chun-Cheng Zhou、Han-Lin Song、Zong-Bo Xie、Zhang-Gao Le

  DOI：10.1016/j.tetlet.2018.07.047

  日期：2018.8

  cross-dehydrogenative-coupling reaction between N-arylglycine esters and imidazo[1,2-a]pyridines for the construction of CC bond was developed. A range of N-arylglycine esters and imidazo[1,2-a]pyridines were able to undergo the CDC reaction readily to afford α-heteroaryl substituted α-amino acid derivatives in good to excellent yields. A tentative mechanism for the photoredox reaction was also proposed. Importantly

  N-芳基甘氨酸酯与咪唑并[1,2- a ]吡啶之间温和方便的可见光促进的交叉脱氢偶联反应被用于构建C C键。一系列的N-芳基甘氨酸酯和咪唑并[1,2- a ]吡啶能够很容易地进行CDC反应，从而以良好或优异的收率得到α-杂芳基取代的α-氨基酸衍生物。还提出了光氧化还原反应的初步机制。重要的是，在这种可见光促进的转化中使用铜（II）盐作为唯一催化剂使该反应可持续且实用。
• Iodine–ammonium acetate promoted reaction between 2-aminopyridine and aryl methyl ketones: a novel approach towards the synthesis of 2-arylimidazo[1,2-a]pyridines
  作者：Dilpreet Kour、Rajni Khajuria、Kamal K. Kapoor

  DOI：10.1016/j.tetlet.2016.08.058

  日期：2016.10

  I2–NH4OAc was found to be an efficient system for the metal-free synthesis of diversely substituted imidazo[1,2-a]pyridines 3a–r from 2-aminopyridine 1 and aryl methyl ketones 2a–r in one pot. 2-Arylimidazo[1,2-a]pyridines 3a–r were obtained in good to excellent yields via in situ generation of an Ortoleva–King intermediate (pyridinium iodide), followed by NH4OAc-assisted cyclization.

  发现I 2 -NH 4 OAc是一种有效的系统，可在一锅中由2-氨基吡啶1和芳基甲基酮2a - r进行无取代合成咪唑并[1,2- a ]吡啶3a - r的无金属合成。通过原位生成Ortoleva-King中间体（碘化吡啶），然后进行NH 4 OAc辅助环化，可以很好地获得2-ArylimidazOAzo [1,2- a ]吡啶3a – r。
• Visible light-induced photocatalytic C–H ethoxycarbonylmethylation of imidazoheterocycles with ethyl diazoacetate
  作者：Suvam Bhattacharjee、Sudip Laru、Sadhanendu Samanta、Mukta Singsardar、Alakananda Hajra

  DOI：10.1039/d0ra05795a

  日期：——

  A visible light-mediated regioselective C3-ethoxycarbonylmethylation of imidazopyridines with ethyl diazoacetate (EDA) was achieved under mild reaction conditions. In contrast to the carbene precursors from α-diazoester a first C3-ethoxycarbonylmethylation of imidazopyridines via a radical intermediate has been established. The present methodology provides a concise route to access pharmacologically

  在温和的反应条件下，用重氮乙酸乙酯 (EDA) 实现了咪唑并吡啶的可见光介导的区域选择性 C3-乙氧基羰基甲基化。与来自 α-重氮酯的卡宾前体相比，已经建立了咪唑并吡啶通过自由基中间体的第一次 C3-乙氧基羰基甲基化。本方法提供了一种以高产率获得具有广泛官能团耐受性的药理学有用酯的简明途径。