Towards applications of metal–organic frameworks in catalysis: C–H direct activation of benzoxazole with aryl boronic acids using Ni<sub>2</sub>(BDC)<sub>2</sub>(DABCO) as an efficient heterogeneous catalyst
作者:Nam T. S. Phan、Chung K. Nguyen、Tung T. Nguyen、Thanh Truong
DOI:10.1039/c3cy00503h
日期:——
Ni3(BTC)2, Ni(HBTC)(BPY), and that of some common nickel salts such as NiCl2, Ni(NO3)2, Ni2SO4, and Ni(OAc)2. To the best of our knowledge, application of Ni2(BDC)2(DABCO) in the field of catalysis as well as the C–C crosscoupling reaction via direct C–Hfunctionalization using a nickel heterogeneous catalyst have not previously been reported in the literature.
A highly efficient palladium-catalyzed arylation of azoles at the C2-position using 1-aryltriazenes as aryl reagents was developed. Azoles including oxazoles, thiazoles, imidazoles, 1,3,4-oxadiazoles, and oxazolines could react with 1-aryltriazenes smoothly to generate the corresponding products in good to excellent yields, and various substitution patterns were tolerated toward the reaction.
The palladium-catalyzed tandem decarboxylation, carbon–carbon triple bond oxidation and decarbonylative arylation of the benzoxazole C–H bond
作者:Dongfang Liu、Bin Liu、Jiang Cheng
DOI:10.1039/c3ra41185k
日期:——
A palladium-catalyzed arylation of benzoxazole has been developed. This protocol involves the tandem decarboxylation and oxidation of a carbonâcarbon triple bond followed by decarbonylative arylation of the benzoxazole CâH bond.
Iodine-mediated arylation of benzoxazoles with aldehydes
作者:Yew Chin Teo、Siti Nurhanna Riduan、Yugen Zhang
DOI:10.1039/c3gc41027g
日期:——
A simple and efficient methodology for the arylation of benzoxazoles with aldehydes using iodine as the mediator has been developed. The reaction proceeded smoothly with a range of substrates to give the corresponding arylated products in moderate to good yields.
OMS-2/H<sub>2</sub>O<sub>2</sub>/Dimethyl Carbonate: An Environmentally-Friendly Heterogeneous Catalytic System for the Oxidative Synthesis of Benzoxazoles at Room Temperature
catalyst for the oxidativesynthesis 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
锰八面体分子筛(OMS-2)被发现是一种高效且可回收的异构催化剂,用于在室温下以克为单位从酚亚胺氧化合成苯并恶唑。H 2 O 2和生物基试剂碳酸二甲酯(DMC)分别成功地首次在OMS-2催化的氧化还原反应中用作环境友好型氧化剂和溶剂。苯并恶唑还可以在高温下通过Cu(OH)x / OMS-2-催化的连续氧化转化反应从N-取代的2-氨基苯酚获得。