Ring opening of aziridinium ions with nitrogen nucleophiles was applied to the highly efficient synthesis of optically active vicinal diamines and diethylene triamine pentaacetic acid (DTPA) analogues as potential magnetic resonance imaging (MRI) contrast enhancement agents. The synthetic method features a column-free isolation of the regiospecific and stereospecific nucleophilic substitution products
具有氮亲核试剂的
氮丙啶鎓离子的开环被用于光学合成邻位二胺和
二亚乙基三胺五乙酸(
DTPA)类似物作为潜在的磁共振成像(MRI)造影剂的高效合成。该合成方法的特征在于,对映体富集的
叠氮鎓离子的区域特异性和立体特异性亲核取代产物可以无柱分离,并且产率很高。