Ultrasound-promoted regioselective and stereoselective synthesis of novel spiroindanedionepyrrolizidines by multicomponent 1,3-dipolar cycloaddition of azomethine ylides
作者:Elangovann Chandralekha、Arumugam Thangamani、Ramiah Valliappan
DOI:10.1007/s11164-012-0608-8
日期:2013.3
A series of novel spiroindanedionepyrrolizidines have been synthesized by multicomponent 1,3-dipolar cycloaddition of a variety of (E)-3-aryl-1-(thiophen-2-yl)prop-2-en-1-ones with unstabilized azomethine ylides generated from ninhydrin and l-proline. The reactions were highly regioselective and stereoselective and were conducted with both conventional heating and ultrasonic irradiation conditions
通过将多种(E)-3-芳基-1-(噻吩-2-基)丙-2-烯-1-酮与不稳定的偶氮甲亚胺基团进行多组分1,3-偶极环加成反应,合成了一系列新型螺二氢化茚二酮-吡咯烷基由茚三酮和1-脯氨酸生成。反应是高度区域选择性和立体选择性的,并且在常规加热和超声辐射条件下进行。通常,当在超声条件下进行反应时,观察到较温和的条件以及速率,反应时间和产率的适度改善。产品的区域选择性和立体选择性性质是通过使用单晶X射线结构和光谱技术确定的。