以苯并呋喃氮氧化物衍生物和β-二酮酯化合物为原料,通过改进的贝鲁特反应制备了一系列喹喔啉1,4-二-N-氧化物类似物。目标产物的结构通过NMR、MS、IR和元素分析测量进行表征,并且通过单晶X射线衍射进一步证实了2-carbomethoxy-3-hydroxyquinoxaline-di-N-oxide的结构。其晶体结构属于单斜晶系,空间群C2/c,a = 14.4320 (12) Å, b = 10.7514 (9) Å, c = 13.2728 (11) Å, V = 1958.5 (3) Å 3, Z = 8. X 射线晶体学分析表明,喹喔啉 1,4-二-N-氧化物表现出 acyloin-endiol 互变异构现象。
New ligands for copper-catalyzed C–N coupling reactions with aryl halides
作者:Dong Chen、Kai Yang、Hua Xiang、Sheng Jiang
DOI:10.1016/j.tetlet.2012.10.083
日期:2012.12
2-Carbomethoxy-3-hydroxyquinoxaline-di-N-oxide was identified as an efficient novel ligand for the copper-catalyzedcouplingreactions of aryl iodides, bromides, and chlorides with aliphatic amines and N-containing heterocycles under mild conditions. The catalytic system showed great functional-group tolerance and excellent chemoselectivity.