Herein, we described a cooperative catalyst system consisting of an acridinium photoredox catalyst and a cobalt-based proton-reduction catalyst that is effective for the C-H amination of arenes with concomitant generation of hydrogen. This oxidant free method allows a variety of amines with diverse functional groups to be converted to aromatic amines. Additionally, this protocol can also be extended to hydrolytically unstable benzophenone imines.
N-(Chloroacetyl)- and N-(dichloroacetyl)-N-(xylyl)alanine esters: assignment of the absolute configurations and enantiodifferentiation by the dirhodium method
作者:Edison Díaz Gómez、Jorge Jios、Carlos O. Della Védova、Hugo D. March、Héctor E. Di Loreto、Gábor Tóth、Andras Simon、Dieter Albert、Stefan Moeller、Rudolf Wartchow、Helmut Duddeck
DOI:10.1016/j.tetasy.2005.06.008
日期:2005.7
derivatives) containing either stereogenic centres alone as in 1 and 3 or stereogenic centres plus chiral axes as in 2 and 4 were investigated. The latter have been examined in terms of the absoluteconfigurations of the diastereomers in unresolvable mixtures, which were determined by evaluating NOE contacts in preferred conformations. Although these ligands are weak donors in Rh* adducts, it is easily