Abstract
By catalyst and condition screening, a simple method for the synthesis of benzazole and quinoxaline heterocycles via Cu-catalyzed direct aerobic oxidative cyclocondensation of o-thio/hydroxy/aminoanilines and amines was developed by using air as the safe, cheap, effective, and clean oxidant. Due to the observed great promoting effect of the substrates on the reaction, single CuI can be used as the efficient catalyst without requiring additional oxidation co-catalysts. This method provides a simple and practical way for preparation of the useful benzothiazoles, benzimidazoles and benzoxazoles from amines.
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Notes
Different to the reaction with 2-aminobenzenethiol 2a, the reaction of the 2-phenylethylamine 1o with o-diaminobenzene 4a is successful for quinoxaline derivative synthesis. See Eq. 5.
See the Supporting Information for details
How o-substituted anilines promoted the aerobic amine oxidation step is not exactly clear at present; whereas, according to aerobic amine oxidation reactions catalyzed by quinine-type catalysts [99–105], it is very possible that the reactions proceed via analogous o-iminothioquinone-type catalytic species. For reviews and reports: [55, 56, 99–105].
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We thank ZJNSF for Distinguished Young Scholars (LR14B020002), China Postdoctoral Science Foundation (2016M592520), and NNSFC (21502143) for financial support.
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Liu, J., Wang, C., Ma, X. et al. Simple Synthesis of Benzazoles by Substrate-Promoted CuI-Catalyzed Aerobic Oxidative Cyclocondensation of o-Thio/Amino/Hydroxyanilines and Amines under Air. Catal Lett 146, 2139–2148 (2016). https://doi.org/10.1007/s10562-016-1818-2
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DOI: https://doi.org/10.1007/s10562-016-1818-2