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 Pd-catalyzed dearomative arylborylation of indoles, published in 2019, which mentions a compound: 49609-84-9, Name is 2-Chloronicotinoyl chloride, Molecular C6H3Cl2NO, Product Details of 49609-84-9.
A palladium-catalyzed dearomative arylborylation of indoles is reported, which provides straightforward access to structurally diverse indolines bearing vicinal tetrasubstituted and borylated trisubstituted stereocenters in moderate to good yields with excellent diastereoselectivities. By using a BINOL-based chiral phosphoramidite ligand and an sp2-sp3 mixed-boron reagent, an enantioselective dearomative arylborylation was achieved and chiral boron-containing products were accessed in up to 94% ee. Synthetic transformations of the resulting organoborons were conducted to afford a number of unique indoline derivatives
In addition to the literature in the link below, there is a lot of literature about this compound(2-Chloronicotinoyl chloride)Product Details of 49609-84-9, illustrating the importance and wide applicability of this compound(49609-84-9).
Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate