acid required a melt reaction providing a 78% yield of 3-oxodihydroquinoxalinyl-2-urea 22 and side products. Despite numerous reaction steps, most of these uncatalyzed stoichiometric reactions proceeded quantitatively in the solid state to give only one product (plus water), with unsurpassed atom economy. If catalysis with HCl was tried, the results were inferior. If melt reactions were required it appeared
A Green and Efficient Protocol for the Synthesis of Quinoxaline, Benzoxazole and Benzimidazole Derivatives Using Heteropolyanion-Based Ionic Liquids: As a Recyclable Solid Catalyst
作者:Seyed Vahdat、Saeed Baghery
DOI:10.2174/1386207311316080004
日期:2013.8.1
green synthesis of 2,3-disubstitutedquinoxaline derivatives. These ionic liquids are in the solid state at room temperature and the synthesis is carried out via the one-pot condensation reaction of various o-phenylenediamine with 1,2-diketone derivatives. Benzoxazole and benzimidazole derivatives were also synthesized by these novel catalysts via the one-pot condensation from reaction orthoester with
In water organic synthesis: Introducing itaconic acid as a recyclable acidic promoter for efficient and scalable synthesis of quinoxaline derivatives at room temperature
作者:Kashyap J. Tamuli、Shyamalendu Nath、Manobjyoti Bordoloi
DOI:10.1002/jhet.4231
日期:2021.4
Substituted quinoxalinederivatives are traditionally synthesized by co‐condensation of various starting materials. Herein, we describe a novel environmentally benign in water synthetic route for the synthesis of structurally and electronically diverse ninety quinoxalines with readily available substituted o‐phenylenediamine and 1,2‐diketones using cheap and biodegradable itaconic acid as a mild acid
METHOD FOR PRODUCING CYCLOMETALATED IRIDIUM COMPLEX
申请人:TANAKA KIKINZOKU KOGYO K.K.
公开号:US20180362565A1
公开(公告)日:2018-12-20
The present invention provides a method for producing a cyclometalated iridium complex by use of a non-chlorine iridium raw material. The method for producing a cyclometalated iridium complex includes producing a cyclometalated iridium complex by reacting a raw material including an iridium compound with an aromatic heterocyclic bidentate ligand capable of forming an iridium-carbon bond, the raw material being non-halogenated iridium having a conjugated base of a strong acid as a ligand. Here, the non-halogenated iridium is preferably one containing a conjugated base of a strong acid having a pKa of 3 or less as a ligand.
Synthesis of quinoxaline, benzimidazole and pyrazole derivatives under the catalytic influence of biosurfactant-stabilized iron nanoparticles in water
作者:Satyanarayan M. Arde、Audumbar D. Patil、Ananda H. Mane、Prabha R. Salokhe、Rajashri S. Salunkhe
DOI:10.1007/s11164-020-04240-6
日期:2020.11
thermogravimetric analysis, and BET analysis. The FeNPs were amorphous in nature with average particle size ~ 19 nm and successfully employed as heterogeneous catalyst for the synthesis of quinoxaline, benzimidazole, and pyrazole derivatives in aqueous medium at ambient conditions. The FeNPs could be recycled up to five times with modest change in the catalytic activity. Graphic abstract