Copper-Catalyzed Aerobic 6-Endo-Trig Cyclization of β,γ-Unsaturated Hydrazones for the Divergent Synthesis of Dihydropyridazines and Pyridazines
Zhenwei Fan, Zhangjin Pan, Liangsen Huang, Jiajia Cheng*
*State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, 2 Xueyuan Road, Fuzhou 350116, P. R. China, Email: jjchengfzu.edu.cn
Z. Fan, Z. Pan, L. Huang, J. Cheng, J. Org. Chem., 2019, 84, 4236-4245.
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Cu(II)-catalyzed aerobic 6-endo-trig cyclizations provide 1,6-dihydropyridazines and pyridazines via the judicious choice of reaction solvent. Whereas 1,6-dihydropyridazines were obtained in good yields with MeCN as the reaction solvent, employment of AcOH directly afforded pyridazines in good yields.
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N-heterocycles, pyridazines, oxygen