描述了一种通过α-酮乙烯基叠氮化物和2-氨基吡啶的有效无催化剂环合反应合成咪唑并[1,2- a ]吡啶的新策略。从容易获得的乙烯基叠氮化物和2-氨基吡啶合成了几种咪唑并[1,2- a ]吡啶,并通过简单地蒸发反应溶剂以高纯度形式获得。这种极高的产率和原子经济的方案允许通过级联反应和重排形成三个新的C–N键。
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
Microwave-assisted three-component reaction in conventional solvents and ionic liquids for the synthesis of amino-substituted imidazo[1,2-a]pyridines
作者:Fadime Mert-Balci、Jürgen Conrad、Uwe Beifuss
DOI:10.3998/ark.5550190.0013.318
日期:——
Amino-substituted imidazo(1,2-a)pyridines can be prepared with yields up to 98% within a few minutes by microwave-assisted three-component reaction between 2-aminopyridines, aldehydes and isocyanides using montmorillonite as the catalyst and toluene as the solvent. The organic solvent can be replaced by ionicliquids. With guanidinium salts the microwave-assisted reaction can be performed in the absence