Catalyst-free microwave-promoted one pot synthesis of 2-aryl benzoxazoles using MnO2 nanoparticles as a convenient oxidant under mild condition
作者:Hossein Naeimi、Zahra Rouzegar、Soraya Rahmatinejad
DOI:10.1007/s11164-017-2909-4
日期:2017.8
An efficient and facile protocol for one pot synthesis of a series of 2-aryl benzoxazoles through coupling of o-aminophenol with aromatic aldehydes under microwave irradiation in the presence of MnO2 nanoparticles as oxidant reagent was demonstrated. The MnO2 nanoparticles were prepared via a solid-state chemical reaction technique. The structure of oxidant was assigned by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The target molecules were obtained in good to high yields, high purity and short reaction times. The pure products were identified and characterized by physical and spectral data such as; melting point, IR, 1H NMR and 13C NMR. An efficient and facil protocol for one pot synthesis of a series of 2-aryl benzoxazoles through coupling of o-aminophenol with aromatic aldehydes under microwave irradiation in the precense of MnO2 nanoparticles as oxidant reagent was demonstrated.
展示了一种高效、简便的一锅法合成一系列2-芳基苯并噁唑的协议,通过在微波辐射下将邻氨基酚与芳香醛偶联,使用二氧化锰纳米颗粒作为氧化剂。二氧化锰纳米颗粒采用固态化学反应技术制备。氧化剂的结构通过傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)和扫描电子显微镜(SEM)进行了表征。目标分子以良好到高的产率、高纯度和短反应时间获得。纯产品通过熔点、红外光谱、1H NMR和13C NMR等物理和光谱数据进行了鉴定和表征。