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The Cu/N-ligand/TEMPO catalytic system was first applied to the aerobic oxidative synthesis of heterocycles. As demonstrated, 2-substituted quinazolines and 4H-3,1-benzoxazines were synthesized efficiently from the one-pot reaction of aldehydes with 2-aminobenzylamines and 2-aminobenzyl alcohols, respectively, by employing CuCl/DABCO/4-HO-TEMPO as the catalysts and oxygen as the terminal oxidant.


Bing Han, Xiu-Long Yang, Chao Wang, Yong-Wei Bai, Tai-Chao Pan, Xin Chen, Wei Yu. CuCl/DABCO/4-HO-TEMPO-catalyzed aerobic oxidative synthesis of 2-substituted quinazolines and 4H-3,1-benzoxazines. The Journal of organic chemistry. 2012 Jan 20;77(2):1136-42

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PMID: 22168403

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