Recyclable Heterogeneous Copper(II)-Catalyzed Oxidative Cyclization of 2-Pyridine Ketone Hydrazones Towards [1,2,3]Triazolo[1,5-a]pyridines
Gan Jiang, Yang Lin, Mingzhong Cai*, Hong Zhao*
*Jiangxi Normal University, Nanchang 330022; Guangdong Pharmaceutical University, Guangzhou 510006, P. R. of China,
Email: mzcaijxnu.edu.cn, zhaohong1001
sina.com
G. Jiang, Y. Lin, M. Cai, H. Zhao, Synthesis, 2019, 51, 4487-4497.
DOI: 10.1055/s-0037-1610726
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Abstract
A heterogeneous copper(II)-catalyzed oxidative cyclization of 2-pyridine ketone hydrazones was achieved in ethyl acetate at room temperature in the presence of an MCM-41-anchored bidentate 2-aminoethylamino copper(II) catalyst and air as the oxidant to provide various [1,2,3]triazolo[1,5-a]pyridines in good yields. The catalyst can be recovered by filtration and reused at least seven times.
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Key Words
copper catalysis, [1,2,3]triazolo[1,5-a]pyridines, oxidative cyclization, oxygen, heterogeneous catalysis, N-N coupling
ID: J66-Y2019