Scheme 4.
Alkyl-aryl cross-coupling using 1,4-dihydropyridines. ppy = 2-phenylpyridine. DMI = 1,3-dimethyl-2-imidazolidinone. bpy = 2,2’-bipyridine dMeObpy = 4–4′-dimethoxy-2–2′-bipyridine.
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