TfOH-catalysed PPh3-Promoted Nucleophilic Cyclization Reactions for the Synthesis of Functionalized (Z)-2-imino-benzo[e][1,3]thiazin-4-ones

Tetrahedron, Journal Year: 2025, Volume and Issue: unknown, P. 134676 - 134676

Published: April 1, 2025

Language: Английский

La(OTf)₃-Catalyzed Benzannulation of 2-Arylidene-1H-indene-1,3(2H)-diones with Enamino Esters: Direct Access to Functionalized Fluorenone Derivatives

The Journal of Organic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 7, 2025

An attractive method for the preparation of functional fluorenone derivatives has been developed via La(OTf)3-catalyzed benzannulation 2-arylidene-1H-indene-1,3(2H)-diones with enamino esters. The reaction involves Michael addition, intramolecular cyclization, dehydration, and aromatization in a one-step process affords wide range moderate to good yields. Moreover, this protocol provides several advantages, including broad substrate scope, readily available materials, high atom economy, applicability large-scale synthesis.

Language: Английский

Facile synthesis of 2-substituted benzofurans by intermolecular [3+2] cycloaddition of benzoquinone and vinyl azides under air

Tetrahedron, Journal Year: 2024, Volume and Issue: 167, P. 134277 - 134277

Published: Sept. 21, 2024

Language: Английский