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 Oxidative Enantioselective α-Fluorination of Aliphatic Aldehydes Enabled by N-Heterocyclic Carbene Catalysis, published in 2015, which mentions a compound: 1214711-48-4, Name is (5aS,10bR)-2-(2,4,6-Trichlorophenyl)-4,5a,6,10b-tetrahydro-2H-indeno[2,1-b][1,2,4]triazolo[4,3-d][1,4]oxazin-11-ium tetrafluoroborate, Molecular C18H13BCl3F4N3O, Electric Literature of C18H13BCl3F4N3O.
In the presence of the indenooxazinotriazolium carbene precursor I•BF4-, aliphatic aldehydes such as hydrocinnamaldehydes 4-RC6H4CH2CH2CHO (R = H, Br) underwent chemo- and enantioselective oxidative fluorination with N-fluorobenzenesulfonimide (NFSI) with alcs. such as cyclohexanol to give nonracemic α-fluoroesters such as II in 71-89% yields and in 73-98% ee. II (R = H) was hydrolyzed to its parent acid, converted to an N-benzyl-β-fluoroamine, and reduced to a β-fluoro alc.; II (R = Br) underwent Suzuki coupling to give II (R = Ph).
In addition to the literature in the link below, there is a lot of literature about this compound((5aS,10bR)-2-(2,4,6-Trichlorophenyl)-4,5a,6,10b-tetrahydro-2H-indeno[2,1-b][1,2,4]triazolo[4,3-d][1,4]oxazin-11-ium tetrafluoroborate)Electric Literature of C18H13BCl3F4N3O, illustrating the importance and wide applicability of this compound(1214711-48-4).
Reference:
Quinuclidine – Wikipedia,
Quinuclidine | C7H13N | ChemSpider