Oxidative Amidation of Nitroalkanes with Amine Nucleophiles using Molecular Oxygen and Iodine
作者:Jing Li、Martin J. Lear、Yuya Kawamoto、Shigenobu Umemiya、Alice R. Wong、Eunsang Kwon、Itaru Sato、Yujiro Hayashi
DOI:10.1002/anie.201505192
日期:2015.10.26
encumberance, and epimerizable stereocenters. A direct oxidative method was developed to form amide and peptide bonds between amines and primary nitroalkanes simply by using I2 and K2CO3 under O2. Contrary to expectations, a 1:1 halogen‐bonded complex forms between the iodonium source and the amine, which reacts with nitronates to form α‐iodo nitroalkanes as precursors to the amides.
酰胺和肽的形成通常需要强大而温和的试剂系统。然而,所使用的试剂通常是昂贵且高度复杂的。达到这些目标的新的原子经济和实用的方法是非常可取的。理想情况下,该方法应从易于以手性和非手性形式获得的底物开始,并使用廉价的试剂,这些试剂与多种官能团,空间位阻和可差向立体中心兼容。开发了一种直接氧化方法,只需在O 2下使用I 2和K 2 CO 3即可在胺与伯硝基烷烃之间形成酰胺和肽键。。与预期相反,在碘鎓源和胺之间形成了1:1的卤素键合配合物,该配合物与硝酸盐反应生成α-碘硝基烷烃,作为酰胺的前体。