Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France.
J Am Chem Soc. 2012 Jun 27;134(25):10389-92. doi: 10.1021/ja304095z. Epub 2012 Jun 14.
Metal-free chiral phosphoric acids and chiral calcium phosphates both catalyze highly enantio- and diastereoselective electrophilic α-bromination of enecarbamates to provide an atom-economical synthesis of enantioenriched vicinal haloamines. Either enantiomer can be formed in good yield with excellent diastereo- and enantioselectivity simply by switching the catalyst from a phosphoric acid to its calcium salt.
手性磷酸和手性磷酸钙均能催化烯基碳酰胺的高对映选择性和非对映选择性亲电α-溴化反应,提供一种原子经济性的方法来合成对映体富集的偕卤胺。只需将催化剂从磷酸切换为其钙盐,就可以以优异的非对映选择性和对映选择性从每种对映异构体中以良好的产率获得产物。