在本工作中,一种新颖的双核氧桥连的铁(的合成和表征III)络合物,(FEL APIP)2 ö,其中L APIP是tetradentateo氨基苯酚亚氨基吡啶配体的去质子化形式,进行说明。使用不同的技术对铁络合物进行表征,这些技术包括X射线晶体学,红外光谱,UV-Vis,磁化率和循环伏安法。X射线结构分析表明,在(FeL APIP)2 O配合物的结构中,每个铁(III)是由邻氨基酚酸酯配体的氧代基团,三个胺氮和一个氧原子以扭曲的方锥体结构进行配位的。可变温度磁测量在两个铁(III)中心之间表现出强反铁磁耦合。循环伏安法测量显示出两种准可逆事件,表明在阳极峰区域和金属中心氧化还原(Fe III / Fe II)低电位处理。在2-氨基苯酚和苄醇偶联一锅合成苯并恶唑的过程中,评估了该铁络合物的催化活性。催化剂体系在该转化中显示出高催化活性,并以良好至优异的产率获得了苯并恶唑衍生物。叔丁基氢过氧化物用作氧化剂,需要1
Ruthenium-Catalyzed Synthesis of Benzoxazoles Using Acceptorless Dehydrogenative Coupling Reaction of Primary Alcohols with 2-Aminophenol under Heterogeneous Conditions
作者:Ali Khalafi-Nezhad、Farhad Panahi
DOI:10.1021/cs5000872
日期:2014.6.6
An efficient ruthenium-catalyzed acceptorless dehydrogenative coupling reaction of primary alcohols with 2-aminophenol for one-pot synthesis of benzoxazoles is introduced. The phosphine-functionalized magnetic nano-particles (PFMNPs; Fe3O4@SiO2@PPh2) as a magnetic recyclable phosphorus ligand in the presence of Ru2Cl4(CO)(6) was found to be an efficient heterogeneous catalytic system for promotion of the designed protocol. The reaction was carried out efficiently with a variety of substrates to give the corresponding products in moderate to good yields.