Stereoselective Chlorination and Bromination of Enamides and Enamines via an Electrostatic Attraction Effect Using (1,1-Diacetoxyiodo)benzene and a Halide Source
作者:Linlin Xing、Chunbao Li
DOI:10.1021/acs.joc.5b01603
日期:2015.10.16
structure of the intermediates, the conformations of which are controlled by the electrostatic attractions between the positively charged nitrogen atoms and the oxygen atoms of the carbonyl group. This type of electrostatic effect has never been reported in olefin halogenations. For this reason, the three-membered bromoniumion is only a minor intermediate in the enamine bromination pathway. These methods
An efficientpalladium-catalyzed oxidative amination of olefins with secondary anilines for the synthesis of tertiary (E)-enamines has been developed. Trimethylacetic acid (PivOH) played an important role in the reaction. This protocol tolerates a range of functional groups and is a reliable method for direct synthesis of tertiary (E)-enamines in high yields undermildconditions.
A novel and efficient palladium-catalyzed intramolecular oxidative cyclization of tertiary enamines for the synthesis of 1,3,4-trisubstituted pyrroles and 1,3-disubstituted indoles has been developed. Trifluoroacetic acid plays an important role in the reaction. A series of pyrroles and indoles with substitution patterns that are not easily accessible by traditional routes were synthesized in good