An effective and highly regio- and diastereoselective one-pot method for the synthesis of new polynuclear dispiroheterocyclic systems with five stereogenic centers (dispiro[imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-6,3′-pyrrolidine-2′,3′′-indoles]) comprising pyrrolidinyloxindole and imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine moieties has been developed. The method relies on a 1,3-dipolar cycloaddition of azomethine ylides generated in situ from isatin derivatives and sarcosine to 6-benzylideneimidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-2,7-diones.
一种高效的、高区域和立体选择性的单锅法合成新的多核双螺杂环系统的方法已经发展出来,该系统具有五个立体中心(双螺[咪唑[4,5-e]噻唑并[3,2-b]-1,2,4-三嗪-6,3'-吡咯啉-2',3''-吲哚]),包括吡咯啉氧吲哚和咪唑[4,5-e]噻唑并[3,2-b]-1,2,4-三嗪基团。该方法依赖于从异色烷衍生物和肌氨酸生成的原位产生的偶氮甲基亚胺通过1,3-二极体环加成反应到6-苯甲基亚胺[4,5-e]噻唑并[3,2-b]-1,2,4-三嗪-2,7-二酮上。