A general and efficient intramolecular halo-amination of unactivatedalkenes for the synthesis of various halogenated N-heterocycles was developed via electrochemical anodic oxidation. This protocol proceeds in a simple undivided cell by employing LiI or LiBr as redox mediums and halogen sources. A wide range of halogenated N-heterocycles, including three-, five-, and six-membered N-heterocycles were
Oxidative Intramolecular Bromo-Amination of <i>N</i>-Alkenyl Sulfonamides via Umpolung of Alkali Metal Bromides
作者:Katsuhiko Moriyama、Yuta Izumisawa、Hideo Togo
DOI:10.1021/jo201113r
日期:2011.9.2
The oxidative intramolecular bromo-amination of various N-alkenyl sulfonamides and N-alkenoxyl sulfonamides via umpolung of alkali metal bromides occurred exo-selectively to generate cyclic bromoamides in high yields with good diastereoselectivities. This method provided the desired products without elaborating the stoichiometric amount of corresponding organic waste.