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Symmetric bipyridines commonly serve as ligands for various types of catalytic processes. Nickel catalyzed Ullmann couplings are often used to prepare such bipyridines, however for electron deficient substrates low conversions and/or yields are often reported. We herein report an improved synthesis of trifluoromethyl substituted bipyridines using stoichiometric amounts of Zn(0), NiCl2·6H2O, and Ph...
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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