In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Preparative-Scale Synthesis of Vedejs Chiral DMAP Catalysts, published in 2018-10-19, which mentions a compound: 34941-92-9, Name is 4-Chloro-2-fluoropyridine, Molecular C5H3ClFN, Related Products of 34941-92-9.
A scalable synthesis of chiral Vedejs-type DMAP catalysts is reported. The key step of the synthesis is amination of the enantiomerically pure 4-chloropyridine derivative using well-defined ZnCl2(amine)2 complexes. A series of Zn(II)-amine complexes have been synthesized to explore the scope of the ZnCl2-mediated amination of 4-halopyridines. Mechanistic studies support a Zn(II)-facilitated nucleophilic aromatic substitution as a plausible mechanism for the chlorine-to-amine exchange.
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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem