Stereocontrolled Aziridination of Imines via a Sulfonium Ylide Route and a Mechanistic Study
作者:Xiao-Fang Yang、Ming-Jie Zhang、Xue-Long Hou、Li-Xin Dai
DOI:10.1021/jo0257389
日期:2002.11.1
temperature. trans-Aziridines were also obtained when imines 1 and sulfinimines 9 were reacted with N,N-dimethylacetamide-2-dimethylsulfonium bromide (7) in the presence of a base, respectively. A mechanistic study showed that the stereochemistry of these reactions was controlled by the reactivity of the imines and ylides. A higher reactivity of imines and ylides favors the formation of cis-aziridines, whereas
在室温下,在NaH存在下,N-二苯基膦酰基亚胺1与[3-(三甲基甲硅烷基)烯丙基]二甲基at溴化物(5)的反应主要产生反式乙烯基氮丙啶4。另一方面,主要的产物是顺式乙烯基氮丙啶4当由[3-(三甲基甲硅烷基)烯丙基]二苯基s高氯酸盐(6)的反应制备的预制的内鎓盐与相同的亚胺1在低温下反应时。当亚胺1和亚磺酰亚胺9在碱的存在下分别与N,N-二甲基乙酰胺-2-二甲基s溴化物(7)反应时,也获得了反式氮丙啶。机理研究表明,这些反应的立体化学受亚胺和酰化物的反应性控制。亚胺和烷基化物的较高反应性有利于顺式氮丙啶的形成,