Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 5-Methoxy-1H-indole-2-carbaldehyde, is researched, Molecular C10H9NO2, CAS is 21778-81-4, about Pd-catalyzed cascade allylic alkylation and dearomatization reactions of indoles with vinyloxirane.Reference of 5-Methoxy-1H-indole-2-carbaldehyde.
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