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.
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Tanaka et al. (2008) studied this question.