Introduction of Ether Groups onto Electron-Deficient Nitrogen-Containing Heteroaromatics Using Radical Chemistry under Transition-Metal-Free Conditions
作者:Naoki Okugawa、Katsuhiko Moriyama、Hideo Togo
DOI:10.1002/ejoc.201500584
日期:2015.8
treated with benzoylperoxide in dioxane, tetrahydropyran, tetrahydrofuran, diethylether, and dipropyl ether at 80 °C to form alkylated nitrogen-containing heteroaromatics in good yields under transition-metal-free conditions. This method was successfully applied to the preparation of lariat aza-crown ethers using 18-crown-6 or 15-crown-5 with quinoline and isoquinoline in the presence of benzoyl peroxide
缺电子的含氮杂芳烃,如喹啉、异喹啉和吡啶,在二恶烷、四氢吡喃、四氢呋喃、二乙醚和二丙醚中,在 80 °C 下用过氧化苯甲酰处理,形成烷基化的含氮杂芳烃,在无过渡金属条件。该方法成功地应用于在过氧化苯甲酰存在下使用 18-crown-6 或 15-crown-5 与喹啉和异喹啉在汞灯照射条件下以良好的收率制备套索氮杂冠醚。
cross-dehydrogenative coupling reaction in the presence of benzoyl peroxide was developed. This methodology successfully provided an easy access to a variety of alkyl-substituted quinoxaline, benzoimidazole, pyrazine, pyrimidine, quinoline, isoquinoline, and pyridine derivatives in up to 94% yield under metal-free conditions.
Rare-Earth Y(OTf)<sub>3</sub> Catalyzed Coupling Reaction of Ethers with Azaarenes
作者:Yue-Hua Wu、Nai-Xing Wang、Tong Zhang、Lei-Yang Zhang、Xue-Wang Gao、Bao-Cai Xu、Yalan Xing、Jian-Yi Chi
DOI:10.1021/acs.orglett.9b02763
日期:2019.9.20
Rare-earth catalysis has become a hot topic in the field of catalytic organic reaction. Chain ethers mostly have lower reactivity and lower boiling points which limited their reaction scope. Herein, we found a rare-earth Y(OTf)(3) can catalyze the coupling reaction of ethers especially chain ethers and thioethers with azaarenes. This protocol features simple operations, a broad substrate scope (31 examples), moderate to good yields (up to 85%), and atom economy.
Zelechonok, Yu. B.; Ivanova, L. P.; Zorin, V. V., Doklady Chemistry, 1987, vol. 297, # 11, p. 494 - 496
作者:Zelechonok, Yu. B.、Ivanova, L. P.、Zorin, V. V.、Zlotskii, S. S.、Rakhmankulov, D. L.