A Rhodium(I)-Xylyl-BINAP Catalyzed Asymmetric Ynamide-[2 + 2 + 2] Cycloaddition in the Synthesis of Optically Enriched N,O-Biaryls.
2009
A rhodium(I)-xylyl-BINAP catalyzed asymmetric [2 + 2 + 2] cycloaddition of achiral conjugated aryl ynamides with various diynes is described here. This asymmetric cycloaddition provides a series of structurally interesting chiral N,O-biaryls with excellent enantioselectivity along with a modest diastereoselectivity with respect to both C-C and C-N axial chirality.
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