108-47-4, Chemistry, like all the natural sciences, begins with the direct observation of nature— in this case, of matter.108-47-4, Name is 2,4-Dimethylpyridine, molecular formula is C7H9N. Belongs to chiral-nitrogen-ligands compound. In a article，once mentioned of 108-47-4
The carbocyclization of non-conjugated dienes mediated by organometallics is an important reaction for the synthesis of a variety of carbocyclic derivatives, but the direct annulation of dienes with an inert C?H bond of a substrate has remained unexplored to date. We herein report a series of novel rare-earth dialkyl complexes bearing a phosphinoamide anion and demonstrate that the combination of a mono(phosphinoamido)-ligated scandium dialkyl complex with B(C6F5)3 results in an excellent catalyst for the cis-selective cyclization of 1,5-dienes with the ortho-C(sp2)?H bond of pyridines to afford a new family of pyridyl-functionalized 1,3-disubstituted cyclopentane derivatives containing monocyclic, bicyclic, spirocyclic, and heterocyclic skeletons in moderate to excellent yields with high diastereoselectivities (cis/trans up to 99:1).
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Reference：
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis