A highly efficient protocol for the regio- and stereo-selective synthesis of spiro pyrrolidine and pyrrolizidine derivatives by multicomponent reaction
作者:Anshu Dandia、Anuj K. Jain、Ashok K. Laxkar、Dharmendra S. Bhati
DOI:10.1016/j.tetlet.2013.04.033
日期:2013.6
series of novel spiro[acenaphthylene-1,2′-pyrrolidine] (4), spiro[acenaphthylene-1,2′-pyrrolizidine] (7), and spiro[indoline-3,2′-pyrrolidine] derivatives (9) containing cyano group were successfully synthesized via a three-component 1,3-dipolar cycloaddition reaction of acenaphthenequinone or isatin, sarcosine or proline, and Knoevenagel adducts in refluxing aqueous methanol. In this intermolecular three-component
一系列新的螺[ ac] -1,2'-吡咯烷](4),螺[ ac-1,2,-吡咯烷] ](7)和螺[吲哚啉-3,2'-吡咯烷]衍生物(9)通过在回流的甲醇水溶液中烯醌或靛红,肌氨酸或脯氨酸与Knoevenagel加合物的三组分1,3-偶极环加成反应成功合成了含有氰基的氰基。在这种分子间三组分组合过程中,令人惊讶的是,三个含一个螺碳的立体异构中心得到了很好的控制。环加合物的结构和相对立体化学是通过单晶X射线衍射以及1 H,13 C和HMBC光谱法进行的。