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
bis(indolyl)methanes was developed using 3,5-bis(trifluoromethyl) phenyl ammonium hexafluorophosphate (BFPHP) as a novel organocatalyst. MATERIALS AND METHODS All of the obtained products are known compounds and identified by IR, 1HNMR, 13CNMR and melting points. RESULT Various products were obtained in good to excellent yields under reaction conditions. CONCLUSION The BFPHP organocatalyst demonstrates a novel class
NaOH-Mediated Direct Synthesis of Quinoxalines from <i>o</i>-Nitroanilines and Alcohols via a Hydrogen-Transfer Strategy
作者:Yan-Bing Wang、Linlin Shi、Xiaojie Zhang、Lian-Rong Fu、Weinan Hu、Wenjing Zhang、Xinju Zhu、Xin-Qi Hao、Mao-Ping Song
DOI:10.1021/acs.joc.0c02453
日期:2021.1.1
A NaOH-mediated sustainable synthesis of functionalized quinoxalines is disclosed via redox condensation of o-nitroamines with diols and α-hydroxy ketones. Under optimized conditions, various o-nitroamines and alcohols are well tolerated to generate the desired products in 44-99% yields without transition metals and external redox additives.
Efficient synthesis of quinoxalines from 2-nitroanilines and vicinal diols via a ruthenium-catalyzed hydrogen transfer strategy