Synlett 2024; 35(09): 1019-1022
DOI: 10.1055/a-2204-9522
cluster
Chemical Synthesis and Catalysis in Germany

Bidentate Lewis Acid-Catalyzed Inverse Electron-Demand Diels–Alder Reaction of Phthalazines and Cyclooctynes

Michel Große
a   Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
b   Center of Material Research (LaMa/ZfM), Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
,
Hermann A. Wegner
a   Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
b   Center of Material Research (LaMa/ZfM), Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
› Author Affiliations
The authors acknowledge the LOEWE Program of Excellence of the Federal State of Hesse (LOEWE Focus Group PriOSS ‘Principles of On-Surface Synthesis’) for financial support.


Abstract

Herein we report a method for facilitating the inverse-electron-demand Diels–Alder reaction of 1,2-diazines and cyclooctynes by utilizing a boron-based bidentate Lewis acid catalyst. Readily available electron-deficient and electron-rich phthalazines proved to be suitable substrates in this transformation. The described method enables the facile construction of diversely substituted polycyclic aromatic hydrocarbons fused to eight-membered carbocycles.

Supporting Information



Publication History

Received: 15 October 2023

Accepted after revision: 06 November 2023

Accepted Manuscript online:
06 November 2023

Article published online:
13 December 2023

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