空气为双金属接枝催化下导致吡啶并[2',1':2,3]咪唑并[4,5- c ] [1,2,3]三唑并[1,5- a ]喹啉的一锅级联反应。氧化剂
摘要:
在本文中,我们报道了1,2,3-三唑/喹啉稠合咪唑并的有效一锅合成[1,2一]从2-吡啶(2-溴苯基)咪唑并[1,2一]吡啶,炔烃和叠氮化钠。这种新方法涉及一锅双金属中继催化的级联过程,该过程结合了叠氮化物-炔烃的环加成反应,1,2,3-三唑与芳基溴化物之间的C–N偶联以及1,2,3之间的分子内交叉脱氢C–C偶联-三唑和咪唑并[1,2- a ]吡啶。该协议的显着特征包括简单的起始原料,可持续的氧化剂,减少的合成步骤和高效率。
Copper-Catalyzed Tandem Azide–Alkyne Cycloaddition, Ullmann Type C–N Coupling, and Intramolecular Direct Arylation
摘要:
A ligand-free copper-catalyzed tandem azide-alkyne cycloaddition (CuAAC), Ullmann-type C-N coupling, and intramolecular direct arylation has been described. The designed strategy resulted in the synthesis of a novel trazole-fused azaheterocycle framework. The reaction gave good yields (59-77%) of 1,2,3-triazole-fused imidazo[1,2-a]pyridines in a single step.
A simple and highly efficient protocol for the regioselectivesynthesis of azole-substituted imidazo[1,2-a]pyridines has been developed using a ligand-free, copper-catalyzed Ullmann-type C–N coupling of 2-(2-bromophenyl)imidazo[1,2-a]pyridines with different azoles and in situ generated 1,2,3-triazoles. The reactions proceeded smoothly to furnish azolo-imidazo[1,2-a]pyridines in good to excellent yields