Copper(II)-Mediated Aerobic Synthesis of Imidazo[1,2-<i>a</i>]pyridines via Cascade Aminomethylation/Cycloisomerization of Alkynes
作者:Irina V. Rassokhina、Valerii Z. Shirinian、Igor V. Zavarzin、Vladimir Gevorgyan、Yulia A. Volkova
DOI:10.1021/acs.joc.5b02102
日期:2015.11.6
A single copper(II)-catalyzed three-component cascade aminomethylation/cycloisomerization of propiolates to form imidazo[1,2-a]pyridines was explored. A straightforward method was developed for the practical synthesis of functionalized imidazo[1,2-a]pyridines from benzaldehydes, 2-aminopyridines, and propiolate derivatives catalyzed by Cu(OAc)2 hydrate in the presence of air. The protocol is marked
探索了单一的铜(II)催化的丙酸酯的三组分级联氨甲基化/环异构化形成咪唑并[1,2- a ]吡啶。开发了一种简单的方法,用于在空气中由Cu(OAc)2水合物催化从苯甲醛,2-氨基吡啶和丙酸酯衍生物实际合成官能化的咪唑并[1,2- a ]吡啶。该方案的特点是具有优异的收率,官能团耐受性,最重要的是具有合成咪唑并[1,2 - a ]吡啶基药物分子(如Alpidem)的适应性。
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
The present report highlights a magnetic nano-Fe3O4–KHSO4·SiO2 catalyzedsynthesis of imidazo[1,2-a]pyridines. The synthetic strategy adopted is expedient, versatile, and offers good to excellent yields from readily available starting materials.