3-碘咪唑并[1,2异构仿生有氧合成一个]吡啶通过的CuO X / OMS-2催化的环化串联/碘化及其晚期官能†
摘要:
在基于氧化锰的八面体分子筛OMS-2(CuO x / OMS-2)上负载铜的情况下,由苯乙酮,2-氨基吡啶类化合物催化异构合成好氧合成3-碘咪唑并[1,2- a ]吡啶和我2通过以一锅方式实现串联环化/碘化。作为一种非均相催化剂,OMS-2不仅充当催化性铜物种的载体,而且还充当电子传递介体(ETM),该电子传递介体与Cu结合生成低能量途径以实现快速电子传递。这样,仿生催化氧化可在温和条件下直接将空气用作绿色末端氧化剂,并使用极低的催化剂负载量(0.2 mol%Cu)以中等至优异的收率为相应的产品提供宽底物。在此过程中,在CuO x的辅助下,I 2不仅起着初始环化催化剂的作用/ OMS-2,但也可作为下一个亲电子氧化碘化反应的反应物,这使该反应具有很高的原子经济性。此外,还通过各种偶联反应证明了I-取代的咪唑并[1,2- a ]吡啶的后期功能化,表明了其在合成和药物化学中的潜在应用。而且,该催化剂确实是非均质的并且可重复使用。
Copper-Catalyzed Decarboxylative Three-Component Reactions for the Synthesis of Imidazo[1,2-a]pyridines
作者:Thiruvengadam Palani、Kyungho Park、Manian Rajesh Kumar、Hyun Ming Jung、Sunwoo Lee
DOI:10.1002/ejoc.201200679
日期:2012.9
Imidazo[1,2-a]pyridine derivatives were synthesized through multicomponent couplingreactions of 2-aminopyridines, aldehydes, and alkynecarboxylic acids in the presence of 10 mol-% CuI/Cu(OTf)2. Both aryl- and alkyl-substituted alkynecarboxylic acids, including propiolic acid, were good alkyne sources and afforded the desired imidazo[1,2-a]pyridines in good yields through the decarboxylative coupling
Magnetic Cu0@HAP@γ-Fe2O3 nanoparticles: An efficient catalyst for one-pot three-component reaction for the synthesis of imidazo[1,2-a]pyridines
作者:Wei Sun、Wei Jiang、Gan Zhu、Yiqun Li
DOI:10.1016/j.jorganchem.2018.07.039
日期:2018.10
incorporated magnetichydroxyapatitenanoparticles (Cu0@[email protected]γ-Fe2O3 NPs) was conveniently synthesized via the ion exchange reaction, oxidation, and reduction steps. The structure and composition of the nanohybrid were confirmed by FT-IR, SEM, EDS, TEM, XPS, and TGA. The magnetic Cu0@[email protected]γ-Fe2O3 hybrid can efficiently catalyzed a one-pot multicomponent synthesis of imidazo[1
Tandem Amination/Cycloisomerization of Aryl Propargylic Alcohols with 2-Aminopyridines as an Expedient Route to Imidazo[1,2-a]pyridines
作者:Ping Liu、Chun-Lin Deng、Xinsheng Lei、Guo-qiang Lin
DOI:10.1002/ejoc.201101053
日期:2011.12
A new tandemroute leading to imidazo[1,2-a]pyridines has been explored through the direct amination of arylpropargylicalcohols with 2-aminopyridines and their subsequent intramolecular cycloisomerization. A ZnCl2/CuCl system has been developed to promote this transformation, which resulted in various imidazo[1,2-a]pyridines in moderate to good yields.
Indium(III) bromide has been used for the first time for the synthesis of imidazo[1,2-a]pyridines in a one-pot operation from 2-aminopyridine, aldehydes, and alkynes. InBr3 was found to be more effective for the activation of both alkyne and imine derived from aryl aldehyde and 2-aminopyridine.
溴化铟(III)首次用于由一锅操作由2-氨基吡啶,醛和炔烃合成咪唑并[1,2- a ]吡啶。发现InBr 3对于活化衍生自芳基醛和2-氨基吡啶的炔烃和亚胺都更有效。
CuSO<sub>4</sub>–Glucose for in Situ Generation of Controlled Cu(I)–Cu(II) Bicatalysts: Multicomponent Reaction of Heterocyclic Azine and Aldehyde with Alkyne, and Cycloisomerization toward Synthesis of N-Fused Imidazoles
作者:Sankar K. Guchhait、Ajay L. Chandgude、Garima Priyadarshani
DOI:10.1021/jo3003024
日期:2012.5.4
ethanol (nonanhydrous) under open air has been explored. With this catalysis, the multicomponent cascade reaction of A3-coupling of heterocyclic amidine with aldehyde and alkyne, 5-exo-dig cycloisomerization, and prototropic shift has afforded an efficient and eco-friendly synthesis of therapeutically important versatile N-fused imidazoles. Diverse heterocyclic amidines, several of which are known to