Heterogeneously Porous γ-MnO<sub>2</sub>-Catalyzed Direct Oxidative Amination of Benzoxazole through CH Activation in the Presence of O<sub>2</sub>
作者:Provas Pal、Arnab Kanti Giri、Harshvardhan Singh、Subhash Chandra Ghosh、Asit Baran Panda
DOI:10.1002/asia.201402057
日期:2014.9
Oxidative amination of azoles through catalyticCHbond activation is a very important reaction due to the presence of 2‐aminoazoles in several biologically active compounds. However, most of the reported methods are performed under homogeneous reaction conditions using excess reagents and additives. Herein, we report the heterogeneous, porous γ‐MnO2‐catalyzed direct amination of benzoxazole with
<sup>
<i>n</i>
</sup>Bu<sub>4</sub>NI-catalyzed direct amination of benzoxazoles with tertiary amines using TBHP as oxidant under microwave irradiation
Abstract A facile, efficient, and practical method for nBu4NI-catalyzed direct C–H amination of benzoxazoles with tertiary amines has been developed. The system could be performed in the absence of metal catalyst and only requires tert-butyl hydroperoxide as oxidant under microwave irradiation. A variety of substituted benzoxazol-2-amines were synthesized with moderate to good yield.