Organic Process Research and Development p. 2018 - 2024 (2017)
Update date:2022-08-03
Topics:
Meng, Xu
Wang, Yuanguang
Chen, Baohua
Chen, Gexin
Jing, Zhenqiang
Zhao, Peiqing
A manganese octahedral molecular sieve (OMS-2) was found to be an efficient and recyclable heterogeneous catalyst for the oxidative synthesis of benzoxazoles in the gram-scale from phenolic imines at room temperature. H2O2 and biobased reagent dimethyl carbonate (DMC) were successfully employed as the environmentally friendly oxidant and solvent, respectively, in an OMS-2-catalysted redox reaction for the first time. Benzoxazoles could also be obtained from N-substituted 2-aminophenols via Cu(OH)x/OMS-2-catalyzed sequential oxidative transformation at elevated temperatures.
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