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 Enantioselective Synthesis of Polycyclic Indole Derivatives Based on aza-Morita-Baylis-Hillman Reaction, published in 2015-11-06, which mentions a compound: 21778-81-4, Name is 5-Methoxy-1H-indole-2-carbaldehyde, Molecular C10H9NO2, Name: 5-Methoxy-1H-indole-2-carbaldehyde.
A chiral phosphine-catalyzed asym. aza-Morita-Baylis-Hillman reaction between indole-derived sulfonyl imines and bis(3-chlorophenyl)methyl acrylate has been developed, giving the desired adducts in good yields and enantiomeric excess values along with the further transformations to polycyclic indoles such as dihydropyrido[1,2-a]indole and dihydropyrazino[1,2-a]indole skeleton.
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Reference:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem