American Chemical Society
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Copper-Catalyzed Oxidative Cyclization of 2‑Amino-azaarenes with Lignin Models: Synthesis of 3‑Phenoxy Imidazo Heterocycles

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posted on 2017-04-21, 00:00 authored by Jian Zhang, Xiunan Lu, Tingyan Li, Shanlu Wang, Guofu Zhong
A catalytic oxidative cyclization of 2-aminopyridines or 2-aminobenzothiazole with 2-phenoxyacetophenones (a kind of lignin platform compound) was developed, efficiently providing valuable 3-phenoxy imidazo­[1,2-a]­pyridines or 3-phenoxy benzo­[d]­imidazo­[2,1-b]­thiazoles. The reaction was realized under oxygen by simply using inexpensive CuI as the catalyst.