Asymmetric Synthesis of 1,3-Diamines by Diastereoselective Reduction of Enantiopure N-tert-Butanesulfinylketimines: Unusual Directing Effects of the ortho-Substituent
摘要:
Chiral, nonracemic 1,3-diamines were prepared in a highly diastereoselective reduction of diaryl N-tert-butanesulfinylketimines. Correlation between Facial selectivity of the reduction and E or Z geometry of the starting ketimines suggests involvement of a cyclic transition state for the reduction. The ortho-substituent controls the geometry of N-tert-butanesulfinylketimines in the solid state and provides additional stabilization of the cyclic transition state.
Asymmetric Synthesis of 1,3-Diamines by Diastereoselective Reduction of Enantiopure <i>N</i>-<i>tert</i>-Butanesulfinylketimines: Unusual Directing Effects of the <i>ortho</i>-Substituent
Chiral, nonracemic 1,3-diamines were prepared in a highly diastereoselective reduction of diaryl N-tert-butanesulfinylketimines. Correlation between Facial selectivity of the reduction and E or Z geometry of the starting ketimines suggests involvement of a cyclic transition state for the reduction. The ortho-substituent controls the geometry of N-tert-butanesulfinylketimines in the solid state and provides additional stabilization of the cyclic transition state.
Formation of 6-chloro-4-phenyl-2-quinolone in reaction of dimethyl sulfate with 2-(acetylamino)-5-chlorobenzophenone under phase-transfer conditions