Convenient, scalable and flexible method for the preparation of imidazolium salts with previously inaccessible substitution patterns
作者:Alois Fürstner、Manuel Alcarazo、Vincent César、Christian W. Lehmann
DOI:10.1039/b604236h
日期:——
A high yielding and modular approach to N,N′-disubstituted imidazolium salts is described, providing access to substitution patterns that are beyond the reach of established methodology.
Oxazolium Salts as Organocatalysts for the Umpolung of Aldehydes
作者:Venkata Krishna Rao Garapati、Michel Gravel
DOI:10.1021/acs.orglett.8b02636
日期:2018.10.19
and redox esterification reactions. An N-mesityl oxazolium salt catalyzed homobenzoin reaction of aromatic, heteroaromatic, and aliphatic aldehydes delivered α-hydroxy ketones in high yields. This newtype of catalyst proved remarkably effective for the Stetter reaction of challenging substrates such as β-alkyl-α,β-unsaturated ketones and electron-rich aromaticaldehydes in comparison to common thiazolium