Transition-Metal and Solvent-Free Oxidative C–H Fluoroalkoxylation of Quinoxalinones with Fluoroalkyl Alcohols
摘要:
The first example of oxidative C-H fluoroalkoxylation of quinoxalinones with fluoroalkyl alcohols under transition-metal and solvent-free conditions is described. This approach provides the synthesis of fluoroalkoxylated quinoxaline derivatives with good to excellent yields under mild reactions conditions. This method can also be extended to the facile and efficient synthesis of histamine-4 receptor.
cross-dehydrogenative coupling between quinoxalinones (sp2 C–H) and amines (N–H) in the presence of catalytic iodine is reported. The reaction yields 3-aminoquinoxalinones in moderate to high yields under ambient conditions in dioxane as solvent and aqueous tert-butyl hydroperoxide (TBHP) as the terminal oxidant. The reaction is highly versatile and exhibits good functional group tolerance with a range of primary
Metal-Free C(sp<sup>2</sup>)–H/N–H Cross-Dehydrogenative Coupling of Quinoxalinones with Aliphatic Amines under Visible-Light Photoredox Catalysis
作者:Wei Wei、Leilei Wang、Pengli Bao、Yun Shao、Huilan Yue、Daoshan Yang、Xiaobo Yang、Xiaohui Zhao、Hua Wang
DOI:10.1021/acs.orglett.8b03079
日期:2018.11.16
A novel and efficient visible-light-induced C(sp2)–H/N–H cross-dehydrogenative coupling (CDC)-amination with both primary and secondary aliphatic amines at room temperature in air is developed. This photocatalytic reaction allows the direct formation of 3-aminoquinoxalin-2(1H)-ones via CDC-amination in the absence of any external oxidant added from outside. Preliminary mechanistic studies reveal that
Direct oxidative C H amination of quinoxalinones under copper-organic framework catalysis
作者:Thanh T. Hoang、Tuong A. To、Vi T.T. Cao、Anh T. Nguyen、Tung T. Nguyen、Nam T.S. Phan
DOI:10.1016/j.catcom.2017.07.012
日期:2017.11
amination of quinoxalin-2(1H)-ones with amines to produce 3-aminoquinoxalin-2(1H)-ones. High yields were achieved in the presence of molecular oxygen as the oxidant. This framework was more catalytically active than a number of MOF-based catalysts. The Cu-CPO-27 also displayed higher performance than CuFe2O4 nanoparticles. The copper-organic framework catalyst could be reutilized in the synthesis of 3-a
合成了铜-有机骨架Cu-CPO-27,并将其用作可再循环的多相催化剂,用于将quinoxalin-2(1 H)-与胺直接进行C H胺化反应,生成3-aminoquinoxalin-2(1 H)-那些。在分子氧作为氧化剂存在下实现了高收率。该框架比许多基于MOF的催化剂更具催化活性。Cu-CPO-27还显示出比CuFe 2 O 4纳米颗粒更高的性能。铜-有机骨架催化剂可通过直接C重复利用在3-氨基喹喔啉-2(1 H)-one的合成中氨化反应,催化性能没有明显降低。据我们所知,这是第一个生成3-aminoquinoxalin-2(1 H)-ones的非均相催化方案。
Copper-catalysed oxidative amination of quinoxalin-2(1H)-ones with aliphatic amines
作者:Yi Li、Ming Gao、Lianhui Wang、Xiuling Cui
DOI:10.1039/c6ob01283c
日期:——
A novel, efficient and practical method for copper-catalysed oxidative C-3 amination of quinoxalin-2(1H)-ones with primary or secondary amines as the nitrogen sources has been developed. A wide variety of 3-aminoquinoxalin-2(1H)-ones were prepared in up to 98% yield with good functional group tolerance for 24 examples. This synthetic strategy features atom economy, concise steps, easy operation, and