One-pot preparation of isocyanides from amines and their multicomponent reactions: crucial role of dehydrating agent and base
作者:Sankar K. Guchhait、Garima Priyadarshani、Vikas Chaudhary、Darshan R. Seladiya、Tapan M. Shah、Nikita P. Bhogayta
DOI:10.1039/c3ra40347e
日期:——
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–Bienaymé reactions). This method provides a significant solution to known synthetic difficulties of isocyanides. In this approach
A microwave-promoted highly flexible and efficientUgi-type multicomponent reaction of heterocyclic amidines with aldehydes and isocyanides catalyzed by zirconium(IV) chloride was developed. The general protocol offered the very reliable synthesis of a library of medicinally important, widely versatile N-fused aminoimidazoles in excellent yields. Poorly reactive heterocyclic amidines, functionally
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。
Copper-catalyzed four-component synthesis of imidazo[1,2-a]pyridines via sequential reductive amination, condensation, and cyclization
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.
描述了一种新颖有效的四组分合成2,3-二取代的咪唑并[1,2- a ]吡啶的方法。叠氮化钠经铜催化的2-溴吡啶的还原胺化反应,然后依次缩合并与醛和异氰酸酯环化,可得到相应的咪唑并[1,2- a ]吡啶。
Efficient Synthesis of 3-Aminoimidazo[1,2-a] Pyridines Using Silica-Supported Perchloric Acid (HClO4-SiO2) as a Novel Heterogenous Catalyst
作者:Azizollah Habibi、Zahra Tarameshloo、Shahnaz Rostamizadeh、Ali M. Amani
DOI:10.2174/157017812800167439
日期:2012.3.1
An efficient and green protocol for synthesis of 3-aminoimidazo[1,2-a] pyridine derivatives through a three-component reaction of aldehyde, 2-amino pyridine and isocyanide in the presence of silica-supportedperchloricacid (HClO4-SiO2) is described in this paper. The solid catalyst could be recycled and reused.