Stereocontrolled 1,3-dipolar cycloadditions using Oppolzer's camphor sultam as the chiral auxiliary for carbonyl stabilized azomethine ylides
作者:Philip Garner、Özdemir Dogan、Wiley J. Youngs、Vance O. Kennedy、John Protasiewicz、Rebecca Zaniewski
DOI:10.1016/s0040-4020(00)00998-4
日期:2001.1
Two complementary approaches to substituted pyrrolidines via stereocontrolled 1,3-dipolar cycloaddition reactions of chiral azomethine ylides are described. In one approach, chiral azomethine ylides were generated by thermolysis of aziridine carboxylate sultams and trapped with a variety of dipolarophiles to give good yields of the corresponding cycloadducts. In the second approach, chiral azomethine
描述了通过手性偶氮甲亚胺基团的立体控制的1,3-偶极环加成反应来取代吡咯烷的两种互补方法。在一种方法中,通过将氮丙啶羧酸酯的sultams热解产生手性的甲亚胺基团,并用多种偶极亲和剂捕获,以得到相应环加合物的良好收率。在第二种方法中,通过“亚胺互变异构化”从甘氨酰磺胺生成手性偶氮甲亚胺,并用双极性亲和剂捕获,得到相应环加合物的良好收率。