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 cascade allylic alkylation and dearomatization reactions of indoles with vinyloxirane, published in 2016, which mentions a compound: 21778-81-4, Name is 5-Methoxy-1H-indole-2-carbaldehyde, Molecular C10H9NO2, Recommanded Product: 21778-81-4.
A palladium-catalyzed cascade allylic alkylation reaction of di-Me malonate tethered indoles with vinyloxirane was developed through intramol. nucleophilic ring-opening of vinyloxirane followed by subsequent intramol. Friedel-Crafts type allylic alkylation or allylic dearomatization. This protocol provided an efficient method to synthesize structurally diverse tetrahydrocarbolines e.g., I, and spiroindolenine derivatives e.g., II, under mild conditions.
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Reference:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem