Mechanism of Oxidative Amidation of Nitroalkanes with Oxygen and Amine Nucleophiles by Using Electrophilic Iodine
作者:Jing Li、Martin J. Lear、Eunsang Kwon、Yujiro Hayashi
DOI:10.1002/chem.201600540
日期:2016.4.11
base, and oxygen. Herein, we systematically investigated the mechanism and likely intermediates of such methods. We conclude that an amine–iodonium complex first forms through N−halogen bonding. This complex reacts with aci‐nitronates to give both α‐iodo‐ and α,α‐diiodonitroalkanes, which can act as alternative sources of electrophilic iodine and also generate an extra equimolar amount of I+ under O2
最近,我们开发了一种直接的方法将伯硝基烷烃氧化转化为酰胺,这需要将碘鎓源与胺,碱和氧混合。在这里,我们系统地研究了这种方法的机理和可能的中间产物。我们得出结论,胺碘鎓络合物首先通过N卤素键形成。这个复杂的反作用ACI -nitronates,得到两个α碘-和α,α-diiodonitroalkanes,其可以充当亲电碘的替代来源,并且还生成I的一个额外的等摩尔量+下Ò 2。特别是,证据支持α,α-二碘硝基烷烃中间体与分子氧反应形成过氧加合物。或者,这些四面体中间体厌氧地重排以形成可裂解的亚硝酸酯。在这两种情况下,都建议形成活化酯,使其最终以传统方式与亲核胺反应。