A “one-pot” multicomponent approach to polysubstituted 4-aminopyridines
作者:Jiaan Shao、Wanwan Yu、Zhanying Shao、Yongping Yu
DOI:10.1039/c2cc17850h
日期:——
A novel and facile domino reaction has been developed to synthesize a variety of polysubstituted 4-aminopyridines from α-azidovinylketones, aldehydes and methylamine derivatives in reasonably good yields under mild conditions. Additionally, a possible mechanism is proposed.
synthesis of imidazo[1,2-a]pyridines via efficient catalyst/metal-free annulations of α-keto vinyl azides and 2-aminopyridines is described. Several imidazo[1,2-a]pyridines were synthesized from readily available vinyl azides and 2-aminopyridines and obtained in highly pure form by simply evaporating the reaction solvent. This remarkably high yielding and atom economical protocol allows the formation of three
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。
Visible-Light/Photoredox-Mediated sp<sup>3</sup>
CH Functionalization and Coupling of Secondary Amines with Vinyl Azides in Flow Microreactors
by a visible‐light/[Ru(bpy)3][(PF6)2]‐mediated coupling of vinylazides and secondaryamines in flowmicroreactors. This operationally simple and atom‐economical protocol allows the formation of three new CN bonds through the functionalization of sp3CH bonds adjacent to the secondary nitrogen atom. In order to get mechanistic insight of the coupling reaction, several control experiments were carried
An efficient protocol for the synthesis of structurally diverse imidazoles by Ag2CO3-mediated coupling of vinyl azides with secondary amines was developed, and 22 different examples were synthesized in good to high yields. This operationally simple synthetic strategy allows the formation of three new C–N bonds by cascade reactions that involve sp3 C–H functionalization.
Simple and eco-friendly synthesis of polyfunctionalized 2-aminopyrroles from vinyl azides and α-cyano derivatives has been accomplished with a good to excellent yield. The reaction was performed in ethanol/water co-solvent system without catalyst and the workup was facile. A plausible mechanism has been proposed.