Enantioselective Haloetherification by Asymmetric Opening of meso-Halonium Ions
摘要:
A new approach to enantioselective haloetherification reactions via desymmetrization of in situ-generated meso-halonium ions is described. The combination of N-haloamides as a halogen source and sodium salts of chiral phosphoric acids as catalysts can be used for the cyclization of symmetrical ene-diol substrates, yielding the haloetherification products under practical conditions in enantioenriched form.
Synthesis of Chiral Heterocyclic <i>N</i>
-Haloamides and -imides and Their Applications as Halogenating Agents and Mechanistic Probes
作者:Ulrich Hennecke、Christian H. Müller、Constantin G. Daniliuc
DOI:10.1002/ejoc.201601159
日期:2017.1.18
reports of chiral derivatives of the most common of these reagents such as N-halosuccinimides. Herein, we report the synthesis of new chiral N-halogenated amides and imide derivatives, which are easily accessible from inexpensive starting materials of the chiral pool. These new chiral halogenating agents were then applied as stoichiometric reagents in haloetherification reactions and as mechanistic probes