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 Palladium-catalysed imidoylative spirocyclization of 3-(2-isocyanoethyl)indoles, published in 2021, which mentions a compound: 70-23-5, Name is Ethyl 3-bromo-2-oxopropanoate, Molecular C5H7BrO3, Electric Literature of C5H7BrO3.
A palladium-catalyzed construction of spiroindolines through dearomative spirocyclization of 3-(2-isocyanoethyl)indoles was developed. 2′-Aryl-, vinyl-, and alkyl-substituted spiroindolines were accessed under mild conditions with excellent functional group tolerance. C1-tethered oxindole- and indole-spiroindoline bisheterocycles were generated in high yields via alkene/allene insertion and an imidoylative spirocyclization cascade. Addnl., a tandem dearomatization of two different indoles was realized with N-(2-bromobenzoyl)indoles as the electrophilic coupling partner of 3-(2-isocyanoethyl)indoles, affording polyindoline – spiroindoline bisheterocyclic scaffolds conveniently. Under the catalysis of Pd(OAc)2 and a spinol-derived phosphoramidite ligand, chiral spiroindolines were successfully accessed with up to 95% yield and 85% ee.
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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem