There is also a possibility to prepare in a stepwise fashion suitably substituted 4-aryl-1,4-dihydropyridines with a free nitrogen atom and to oxidize them into axially chiral 4-arylpyridines with a central-to-axial conversion of chirality: Quinonero O, Jean M, Vanthuyne N, Roussel C, Bonne D, Constantieux T, Bressy C, Bugaut X, Rodriguez J.
Angew. Chem. Int. Ed. 2016;
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