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In this study, we report the Brønsted acid-catalyzed synthesis of multi-substituted γ-benzo (thio)pyrones. Both multi-substituted γ-benzopyrones and 4H-1-benzothiopyran-4-ones can be concisely synthesized by directly using o-hydroxybenzoylacetones or substituted thiophenols as starting materials.
Compounds 2a-2p were synthesized by 1,3-aryldi-ketones mixed with MeOH/HCl at 65°C for 4 h and 4a-4e were synthesized by thiophenol and ethyl acetoacetate mixed with PPA at 160°C for 5 h. All these obtained compounds were characterized by NMR or HR-MS.
A series of γ-benzo(thio)pyrone compounds can be synthesized via a mild procedure under the catalyst of Brønsted acid (HCl or PPA).
This synthesis method based on Brønsted acid catalysis has good substrate scope. The reaction mechanism has been verified by density functional theory calculations.
This method aligns with the principles of green chemistry, offers a valuable reference for the synthesis of multi-substituted γ-benzo(thio)pyrones, and broadens the applicability of Brønsted acid-catalyzed green synthesis.
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