601468-08-0Relevant articles and documents
Catalytic activity of aqueous cationic polyurethane dispersions: A novel feature of polyurethanes
Daemi, Hamed,Rad, Reza Rezaieyeh,Barikani, Mehdi,Adib, Mehdi
, p. 10 - 17 (2013)
Polyurethane ionomers are well-known and user-friendly polymers. Here, we introduce their catalytic activity for organic reactions as a novel aspect of these polymers. We selected an isocyanide-based multicomponent reaction for proving the catalytic activity of polyurethane ionomers. Therefore, a convenient and very mild methodology is described for the preparation of 3-aminoimidazo[1,2-a]pyridines via a three component reaction between 2-aminopyridines, aldehydes and isocyanides in the presence of a cationic polyurethane dispersion at low reaction temperatures, in short reaction times and excellent yields.
Magnetic spent coffee ground as an efficient and green catalyst for aerobic oxidation of alcohols and tandem oxidative Groebke–Blackburn–Bienaymé reaction
Farhid, Hassan,Shaabani, Ahmad
, p. 1199 - 1209 (2020/11/09)
Abstract: In this work, magnetic spent coffee ground as a green, inexpensive, and abundant material was synthesized and characterized by a variety of techniques, including X-ray diffraction pattern, thermal gravimetric analysis, scanning electron microscopy, energy-dispersive spectroscopy, inductively coupled plasma optical emission spectrometry, and Fourier transform infrared spectroscopy. The magnetic spent coffee ground was successfully utilized as a catalyst in aerobic oxidation of primary and secondary benzylic alcohols and tandem oxidative Groebke–Blackburn–Bienaymé reaction. Graphic abstract: [Figure not available: see fulltext.].
Diverse Oxidative C(sp2)-N Bond Cleavages of Aromatic Fused Imidazoles for Synthesis of α-Ketoamides and N-(pyridin-2-yl)arylamides
Xu, Fangzhou,Wang, Yanyan,Xun, Xiwei,Huang, Yun,Jin, Zhichao,Song, Baoan,Wu, Jian
, p. 8411 - 8422 (2019/05/17)
An efficient and chemoselective C(sp2)-N bond cleavage of aromatic imidazo[1,2-a]pyridine molecules is developed. A broad scope of amide compounds such as α-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 α-ketoamides exhibit anti-Tobacco Mosaic Virus activity for potential use in plant protection.
Green synthesis of imidazo[1,2-a]pyridines using calix[6]arene-SO3H surfactant in water
Esmaielzade Rostami, Mahshid,Gorji, Banafsheh,Zadmard, Reza
, p. 2393 - 2398 (2018/05/25)
In this research, green synthesis of imidazo[1,2-a]pyridines in the presence of calix[n]arenes-SO3H as a Br?nsted 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 for at least for 5 cycles without any losses of its activity.
Copper-catalyzed four-component synthesis of imidazo[1,2-a]pyridines via sequential reductive amination, condensation, and cyclization
Allahabadi, Emad,Ebrahimi, Sina,Soheilizad, Mehdi,Khoshneviszadeh, Mehdi,Mahdavi, Mohammad
supporting information, p. 121 - 124 (2016/12/23)
A novel and efficient four-component approach for the synthesis of 2,3-disubstituted imidazo[1,2-a]pyridines is described. The copper-catalyzed reductive amination of 2-bromopyridine by sodium azide followed by sequential condensation and cyclization with aldehydes and isocyanides afforded the corresponding imidazo[1,2-a]pyridines in good yields.
Mild and efficient microwave-assisted reusable green CuO nanoparticles catalyzed Groebke-Blackburn-Bienayme reaction
Dandia, Anshu,Khan, Shahnawaz,Parewa, Vijay,Sharma, Amit,Kumawat, Begraj,Rathore, Kuldeep S.
, p. 429 - 438 (2019/01/21)
A convenient, fast and mild protocol for the synthesis of imidazo-fused polyheterocycles via microwave-assisted Groebke-Blackburn-Bienayme reaction catalyzed by CuO NPs has been described. This is the first report of using CuO NPs as green catalyst for th
One-pot preparation of isocyanides from amines and their multicomponent reactions: Crucial role of dehydrating agent and base
Guchhait, Sankar K.,Priyadarshani, Garima,Chaudhary, Vikas,Seladiya, Darshan R.,Shah, Tapan M.,Bhogayta, Nikita P.
, p. 10867 - 10874 (2013/09/02)
A novel one-pot practical approach for the preparation of isocyanide directly from amine and its reaction has been developed. It employs formylation of amine, dehydration of formamide to isocyanide, and its multicomponent reactions (Ugi, Passerini, and Groebke-Blackburn-Bienayme reactions). This method provides a significant solution to known synthetic difficulties of isocyanides. In this approach, the nature and stoichiometric quantities of dehydrating agent and base, and the catalysis-function of by-products were found to play crucial roles. The Royal Society of Chemistry 2013.
Bromodimethylsulfonium bromide (BDMS) catalyzed synthesis of imidazo[1,2-a]pyridine derivatives and their fluorescence properties
Khan, Abu T.,Sidick Basha,Lal, Mohan
supporting information; experimental part, p. 2211 - 2217 (2012/05/19)
A convenient synthetic protocol for the synthesis of imidazo[1,2-a]pyridine has been developed by employing one-pot three-component Ugi reaction by employing aromatic amidine, aromatic aldehyde, and isocyanide using 5 mol % of bromodimethylsulfonium bromide (BDMS) at room temperature. In addition, they also exhibit interesting fluorescence properties, which may be useful for fluorescent probe. Mild reaction conditions, non-aqueous work-up procedure, good yields, short reaction time, and no need of chromatographic separation are some of the salient features of the present protocol.
Efficient synthesis of 3-Aminoimidazo[1,2-a] pyridines using silica-supported perchloric acid (HClO4-SiO2) as a novel heterogenous catalyst
Habibi, Azizollah,Tarameshloo, Zahra,Rostamizadeh, Shahnaz,Amani, Ali M.
experimental part, p. 155 - 159 (2012/07/14)
One pot three-component reaction of 2-amino pyridines, aldehydes and isocyanides in the presence of silicasupported perchloric acid (HClO 4-SiO2), produces 3-aminoimidazo[1,2-a] pyridines in excellent yields. The reaction time is sho
Skeletal diverse synthesis of N-fused polycyclic heterocycles via the sequence of Ugi-type MCR and CuI-catalyzed coupling/tandem Pictet-Spengler reaction
Tyagi, Vikas,Khan, Shahnawaz,Bajpai, Vikas,Gauniyal, Harsh M.,Kumar, Brijesh,Chauhan, Prem M. S.
experimental part, p. 1414 - 1421 (2012/03/11)
Several diversity-oriented syntheses of N-fused polycyclic heterocycles have been demonstrated but most of them are based on point diversity within the same library and usually involve time-consuming sequential multistep syntheses, which also suffer from
