New chiral ionic liquids based on imidazolinium salts
作者:Andreas Winkel、René Wilhelm
DOI:10.1016/j.tetasy.2009.09.015
日期:2009.10
The preparation and application of a new series of chiral ionic liquids are described. The salts are based on imidazolinium cations. Some of the cations also incorporated an axial chirality at the C(2) position next to the central chirality. These cations display a very high rotational barrier along the arene–imidazolinium axis. Furthermore, an analogue with a chiral anion was prepared. The salts have
A Novel General Route for the Preparation of Enantiopure Imidazolines
作者:Nicola A. Boland、Mike Casey、Stephen J. Hynes、Jonathan W. Matthews、Martin P. Smyth
DOI:10.1021/jo0111006
日期:2002.5.1
A novel procedure for the preparation of enantiopure 1,4-disubstituted 2-imidazolines is reported. Enantiopure beta-amino alcohols are converted into N-hydroxyethylamides, which are reacted with excess thionyl chloride, or with thionyl chloride followed by phosphorus pentachloride to yield N-chloroethylimidoyl chlorides. These intermediates are treated with amines and anilines to produce N-chloroethylamidines