Synthesis of Furo[3,2-<i>b</i>]quinolines and Furo[2,3-<i>b</i>:4,5-<i>b′</i>]diquinolines through [4 + 2] Cycloaddition of Aza-<i>o</i>-Quinone Methides and Furans
作者:Lu Lei、Yi-Yun Yao、Li-Juan Jiang、Xiuqiang Lu、Cui Liang、Dong-Liang Mo
DOI:10.1021/acs.joc.9b02953
日期:2020.3.6
An approach for the construction of furo[3,2-b]quinolines and furo[2,3-b:4,5-b']diquinolines is developed through a metal-free [4 + 2] cycloaddition of easily available in situ generated aza-o-quinone methides and furans. The reaction tolerates a wide range of aza-o-quinone methides and substituted furans to afford the corresponding dihydro- or tetrahydrofuroquinolines in good to excellent yields.
A transition-metal-free method for the synthesis of indolines has been developed. In the presence of K2CO3, the cyclization reaction of N-(ortho-chloromethyl)arylamides and iodonium ylides proceeded smoothly at room temperature in moderate to good yields.
已经开发了用于合成二氢吲哚的无过渡金属的方法。在K 2 CO 3的存在下,N-(邻-氯甲基)芳基酰胺和碘鎓碘化物的环化反应在室温下以中等至良好的收率顺利进行。
Synthesis of Fullerotetrahydroquinolines via [4 + 2] Cycloaddition Reaction of [60]Fullerene with in Situ Generated Aza-<i>o</i>-quinone Methides
作者:Sheng-Peng Jiang、Wen-Qiang Lu、Zhan Liu、Guan-Wu Wang
DOI:10.1021/acs.joc.7b02897
日期:2018.2.16
An efficient [4 + 2] cycloaddition reaction of [60]fullerene with the in situ generated aza-o-quinone methides from N-(o-chloromethyl)aryl sulfonamides with the assistance of Cu2O has been developed to afford a series of fullerotetrahydroquinolines. This strategy exhibits a broad substrate scope and excellent functional group tolerance. A tentative reaction pathway for the formation of fullerotetrahydroquinolines
Copper(<scp>i</scp>)-catalyzed [4 + 2] cycloaddition of aza-<i>ortho</i>-quinone methides with bicyclic alkenes
作者:Lu Lei、Yu-Feng Liang、Cui Liang、Jiang-Ke Qin、Cheng-Xue Pan、Gui-Fa Su、Dong-Liang Mo
DOI:10.1039/d1ob00319d
日期:——
tetrahydroquinoline-fused bicycles bearing multiple stereocenters are prepared in good yields with high diastereoselectivity through Cu2O-catalyzed [4 + 2] cycloaddition of aza-ortho-quinone methides (ao-QMs) with bicyclicalkenes. Mechanistic studies reveal that the Cu(I) catalyst not only promotes the formation of ao-QMs through a radical process by single electron transfer but also accelerates [4 + 2] cycloaddition
通过 Cu 2 O 催化的 [4 + 2] 氮杂邻醌甲基化物 (a o -QMs) 与双环烯烃的环加成反应,以良好的收率和高非对映选择性制备了多种具有多个立体中心的四氢喹啉稠合双环化合物。机理研究表明,Cu( I )催化剂不仅通过单电子转移的自由基过程促进a o -QMs的形成,而且还加速了[4 + 2]环加成反应。该反应很容易以克级进行,并且获得的四氢喹啉融合的自行车可以转化为不同的四氢喹啉支架。
Construction of Optically Active Indolines by Formal [4+1] Annulation of Sulfur Ylides and<i>N</i>-(<i>ortho</i>-Chloromethyl)aryl Amides
Get asymmetric! Asymmetric [4+1] annulation of sulfur ylides and N‐(ortho‐chloromethyl)arylamides allowed the formation of the desired cycloadduct with moderate to high yields and enantioselectivities (see scheme). The described strategy, taking advantage of chiral sulfur ylides, represents a direct procedure to access chiral 2‐substituted indolines.