One-Pot Construction of Indolo[2,3-<i>b</i>]quinoxalines through Ruthenium-Catalyzed <i>Ortho</i> C–H Bond Functionalization of 2-Arylquinoxalines with Sulfonyl Azides
N-substituted indolo[2,3-b]quinoxalines has been developed through a Ru(II)-catalyzed ortho C–H functionalization of 2-arylquinoxalines with sulfonyl azides and further oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone in one pot. This double C–N bond formation strategy provides a new efficient route for the preparation of a series of biologically relevant 6H-indolo[2,3-b]quinoxaline derivatives in
N-取代的吲哚并[2,3- b ]喹喔啉的合成是通过Ru(II)催化的2-芳基喹喔啉与磺酰叠氮化物的邻位C-H官能化并用2,3-二氯-5进一步氧化而开发的, 6-二氰基-1,4-苯醌一锅。这种双C-N键形成策略为制备一系列生物相关的6 H-吲哚[2,3- b ]喹喔啉衍生物提供了一条新的有效途径,产率高达94%,表明底物适用范围广泛。初步的机理研究表明,连续的 C-N 键形成是通过第一步中五元钌环中间体的形成和第二步中自由基机制的形成进行的。
Visible light promoted tandem dehydrogenation-deaminative cyclocondensation under aerobic conditions for the synthesis of 2-aryl benzimidazoles/quinoxalines from <i>ortho</i>-phenylenediamines and arylmethyl/ethyl amines
作者:Firdoos Ahmad Sofi、Rohit Sharma、Ravi Rawat、Asit K. Chakraborti、Prasad V. Bharatam
DOI:10.1039/d0nj03002c
日期:——
Visible light promoted dominosynthesis of 2-aryl benzimidazoles is reported through the reaction of ortho-phenylenediamines and arylmethyl amines underaerobicconditions. The methodology has wide substrate scope and tolerates a wide range of functional groups affording the products in high yields. The use of arylethyl amines instead of arylmethyl amines gives 2-aryl quinoxalines.
Direct Aerobic Oxidative Reactions of 2-Hydroxyacetophenones
作者:Subas Chandra Sahoo、Utpal Nath、Subhas Chandra Pan
DOI:10.1002/ejoc.201700909
日期:2017.8.17
Metal-free and external-oxidant-free aerobicoxidative reactions of 2-hydroxyacetophenones are developed. The reactions are based on the aerobic formation of small equilibrium quantities of 2-keto aldehydes. Phthalides, quinoxalines, α-ketoamides, and olefins can be formed in moderate to good yields directly from alcohols. DIPEA = diisopropylethylamine.
Iron-Catalyzed Annulation of 1,2-Diamines and Diazodicarbonyls for Diverse and Polyfunctionalized Quinoxalines, Pyrazines, and Benzoquinoxalines in Water
作者:Rameshwar Prasad Pandit、Sung Hong Kim、Yong Rok Lee
DOI:10.1002/adsc.201600503
日期:2016.11.17
construction of polyfunctionalized quinoxalines has been developed. The key strategy includes the one‐pot domino N−H insertion, cyclization, and oxidation reactions. This protocol offers a safe and mild synthetic approach to access a variety of quinoxalinederivatives in high yields. This methodology also allows the formation of biologically interesting pyrazines and benzoquinoxalines.
Logic design and synthesis of quinoxalines via the integration of iodination/oxidation/cyclization sequences from ketones and 1,2-diamines
作者:Mi Lian、Qi Li、Yanping Zhu、Guodong Yin、Anxin Wu
DOI:10.1016/j.tet.2012.09.056
日期:2012.11
A novel protocol for the synthesis of quinoxalines has been developed from simple ketones and 1,2-diamines. This process underwent a logic approach to bis-substituted quinoxalines via a consecutive iodination/Kornblum oxidation/cyclization in the presence of I2/CuO/DMSO and to mono-substituted quinoxalines via an iodination/cyclization/aromatization in the presence of I2/CuO/K3PO4·3H2O.
从简单的酮和1,2-二胺开发了一种新颖的喹喔啉合成方案。此过程通过连续碘化经历了一个逻辑方式双-取代的喹喔啉/ kornblum氧化反应/环化在我的存在2 /的CuO / DMSO中,并通过以单取代的喹喔啉碘化/环化/芳构化中的我的存在2 /的CuO / K 3 PO 4 ·3H 2 O.