Chiral sulfoxide and phosphoxides having unsymmetrically substituted heteroatom centers have attracted a great deal of attention, and their preparation and utilization have been extensively studied because of their usefulness in recent enantioselective syntheses. 1 On the other hand, N-chiral amine oxides, which are nitrogen analogues of these compounds, have been much less investigated in spite of their great potential for chiral ligands of transition metal ...