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 Experimental and Computational Investigations of the Reactions between α,β-Unsaturated Lactones and 1,3-Dienes by Cooperative Lewis Acid/Broensted Acid Catalysis, published in 2020-10-05, which mentions a compound: 3393-45-1, Name is 5,6-Dihydro-2H-pyran-2-one, Molecular C5H6O2, SDS of cas: 3393-45-1.
The reactions of α,β-unsaturated δ-lactones with activated dienes such as 1,3-dimethoxy-1-[(trimethylsilyl)oxy]-1,3-butadiene (Brassard’s diene) are barely known in literature and show high potential for the synthesis of isocoumarin moieties. An in-depth investigation of this reaction proved a stepwise mechanism via the vinylogous Michael-products. Subsequent cyclization and oxidation by LHMDS and DDQ, resp., provided six mellein derivatives (30-84%) and four angelicoin derivatives (40-78%) over three steps. DFT-calculations provide insights into the reaction mechanism and support the theory of a stepwise reaction.
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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI