Cu(OTf)2-catalyzed synthesis of imidazo[1,2-a]pyridines from α-diazoketones and 2-aminopyridines
摘要:
-alpha-Diazoketones undergo smooth coupling with 2-aminopyridines in the presence of 10 mol % of copper(II) triflate to produce the corresponding 2-substituted imidazo[1,2-a]pyridines (IPs) in excellent yields with high selectivity. Rh-2(OAc)(4) is also found to be an equally effective catalyst for this transformation. (C) 2007 Elsevier Ltd. All rights reserved.
A Carbonylation Approach Toward Activation of C<sub>sp2</sub>-H and C<sub>sp3</sub>-H Bonds: Cu-Catalyzed Regioselective Cross Coupling of Imidazo[1,2-<i>a</i>]pyridines with Methyl Hetarenes
作者:Sai Lei、Yingying Mai、Caijuan Yan、Jianwen Mao、Hua Cao
DOI:10.1021/acs.orglett.6b01588
日期:2016.8.5
An efficient copper-catalyzed selective cross coupling of imidazo[1,2-a]pyridines with methyl hetarenes has been reported. This transformation opened a new route to synthesize the C-3 carbonyl imidazo[1,2-a]pyridine derivative, which is a common structural motif in natural products and pharmaceuticals. 18O-labeling experiments indicated that the oxygen source of products originated from O2.
已经报道了咪唑并[1,2- a ]吡啶与甲基己烯的有效铜催化选择性交叉偶联。这种转变为合成C-3羰基咪唑并[1,2- a ]吡啶衍生物开辟了一条新途径,该衍生物是天然产物和药物中常见的结构基序。18 O-标记实验表明产物的氧源来自O 2。
Regioselective copper-catalyzed thiolation of imidazo[1,2-a]pyridines: an efficient C–H functionalization strategy for C–S bond formation
Regioselective copper-catalyzed thiolation of imidazo[1,2-a]pyridines.
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Regioselective Copper-Catalyzed Oxidative Cross-Coupling of Imidazo[1,2-<i>a</i>]pyridines with Methyl Ketones: An Efficient Route for Synthesis of 1,2-Diketones
作者:Sai Lei、GuiJun Chen、Yingying Mai、Longbin Chen、Huiyin Cai、Jingwen Tan、Hua Cao
DOI:10.1002/adsc.201500803
日期:2016.1.7
An efficientcopper‐catalyzedoxidativecoupling of imidazo[1,2‐a]pyridines with methyl ketones to directly generate structurally sophisticated 1,2‐dicarbonyl imidazo[1,2‐a]pyridine derivatives under oxidative conditions is described. The reaction proceeds in good yields using the environmental friendly molecular oxygen as the oxidant. 18O‐Labelling experiments unambiguously established that the oxygen
描述了咪唑并[1,2- a ]吡啶与甲基酮的有效铜催化氧化偶联,可在氧化条件下直接生成结构复杂的1,2-二羰基咪唑并[1,2- a ]吡啶衍生物。使用环境友好的分子氧作为氧化剂,反应以良好的产率进行。18 O-Labelling实验明确地确定了二羰基产物中的氧气源自氧气而不是水。
Magnetic Supported Copper Nanoparticles: An Efficient Heterogeneous Catalyst for the Synthesis of 1,2-Diketones by Cross-Coupling Reaction of Imidazo[1,2-<i>a</i>]pyridines with Methyl Ketones
methods were also used to acquire information about the size, oxidation state, and crystallinity of the nanoparticle catalyst. With this method, a variety of pharmaceutically important 1,2-dicarbonyl imidazo[1,2-a]pyridines were readily synthesized in moderate to good yields. The catalyst was easily separated from the reaction mixture by using an external magnetic field and could be recycled 6 times with
facile transition-metal-free regioselective halogenation of imidazo[1,2-a]pyridines using sodium chlorite/bromite as the halogen source is presented. The reaction has provided an efficient method for the formation of C–Cl or C–Br bonds to synthesize 3-chloro or 3-bromo-imidazo[1,2-a]pyridines which were then efficiently transformed into imidazo[1,2-a]pyridine core π-systems by Suzuki–Miyaura reactions
提出了一种使用亚氯酸钠/亚溴酸钠作为卤素源的咪唑并[1,2- a ]吡啶的简便的无过渡金属区域选择性卤化反应。该反应为形成C-Cl或C-Br键以合成3-氯或3-溴-咪唑并[1,2- a ]吡啶提供了一种有效的方法,然后将其有效转化为咪唑并[1,2- a ]吡啶核心π-系统通过铃木-宫浦反应。