Synonyms:4,5-Dihydro-1H-1,2,4-triazole;
95% *data from raw suppliers
The research presents a novel method for synthesizing 1,2,4-triazolines and 1,2,4-triazoles using visible light-induced cyclization reactions. The key chemicals involved in this study include 2H-azirines and azodicarboxylates, which serve as the primary reactants for the [3+2] cyclization process. The reaction is catalyzed by a photosensitizer, specifically 9-mesityl-10-methylacridinium perchlorate (I), under blue LED illumination in dichloroethane (DCE) solvent at room temperature. The resulting 1,2,4-triazolines can be further converted into 1,2,4-triazoles under basic conditions or through photoredox catalysis. The study also explores the scope of the reaction with various substituents on both the azodicarboxylates and 2H-azirines, demonstrating good to excellent yields. Additionally, the researchers investigated the direct aromatization of 1,2,4-triazolines to 1,2,4-triazoles under visible light, achieving high yields and regioselectivity. The synthesized compounds can be transformed into biologically active molecules through additional mild reactions, highlighting the potential applications of this method in the synthesis of nitrogen-containing heterocyclic compounds.
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