Non-biaryl atropisomers derived from carbohydrates. Part 3: Rotational isomerism of sterically hindered heteroaryl imidazolidine-2-ones and 2-thiones
作者:Martín Ávalos、Reyes Babiano、Pedro Cintas、Michael B. Hursthouse、José L. Jiménez、Mark E. Light、Juan C. Palacios、Guadalupe Silvero
DOI:10.1016/j.tet.2005.06.017
日期:2005.8
The present work describes in detail the preparation and structural characterization of a series of heteroaryls in which an o,o′-disubstituted phenyl ring is connected through a single C–N bond to a heterocyclic fragment of a chiral imidazolidine-2-one or 2-thione. As a consequence of hindered rotation, some of these substances exist as stable rotamers at room temperature and can easily be separated