Enantioenriched N-aryl-2-pyridones with axially chiral C-N bonds were prepared by a cationic rhodium(I)-BINAP or tol-BINAP-catalyzed enantioselective [2+2+2] cycloaddition of alkynes with ortho-substituted phenyl isocyanates.
通过阳离子
铑(I)-BINAP 或
甲苯-BINAP 催化的
炔烃与正交取代的苯基
异氰酸酯的对映选择性 [2+2+2] 环加成,制备了具有轴向手性 C-N 键的 N-芳基-2-
吡啶酮。