Optically pure (S)- and (R)-4,5-dihydro-3H-4-methyldinaphth[2,1-c; 1′,2′-e]azepines. Application to the synthesis of new bidentate ligands with axial asymmetry
作者:Irena G. Stará、Ivo Starý、Jiří Závada
DOI:10.1016/0957-4166(92)80007-j
日期:1992.11
Easily available ephedrinium salts (S,1R,2S)- and (R,1R,2S)-2 on treatment with alkoxide base afford enantiomerically pure dihydroazepines (S)- and (R)-1, respectively, in quantitative yields. Cleavage of the corresponding dihydroazepinium quaternary salts (S)- and (R)-4 with N- and S-nucleophiles provides a simple approach to a new series of 1,1'-binaphthalene ligands with two different donor groups in 2,2'-positions.