针对有价值的甲基化过程,在这项工作中首次将易于获得且价格低廉的N , N , N' , N' -四甲基乙二胺(TMEDA) 确定为一种新的甲基化来源。凭借这种简单的甲基化试剂,开发了一种简便实用的N-杂芳烃直接 C-H 甲基化方案,具有反应条件温和、底物范围广和可扩展性等特点。机理研究表明,基本上涉及顺序光氧化还原、碱基辅助质子转移、碎裂和互变异构化过程。
Direct <i>para</i>-C–H heteroarylation of anilines with quinoxalinones by metal-free cross-dehydrogenative coupling under an aerobic atmosphere
作者:Jun Xu、Lin Huang、Lei He、Chenfeng Liang、Yani Ouyang、Jiabin Shen、Min Jiang、Wanmei Li
DOI:10.1039/d1gc01899j
日期:——
Herein, a green and efficient metal-free cross-dehydrogenative coupling (CDC) for the direct para-C–H heteroarylation of anilines with quinoxalinones has been described. This reaction is performed in H2O/DMSO (v/v = 2 : 1) usingair as the soleoxidant. Various anilines (primary, secondary and tertiary amines) and quinoxalinones are well compatible, affording the corresponding products in moderate-to-good
本文描述了一种绿色且高效的无金属交叉脱氢偶联(CDC),用于苯胺与喹喔啉酮的直接对-C-H 杂芳基化。该反应在 H 2 O/DMSO (v/v = 2:1) 中进行,使用空气作为唯一氧化剂。各种苯胺(伯胺、仲胺和叔胺)和喹喔啉酮具有良好的相容性,以中等至良好的产率提供相应的产品。这种方法为含氮化合物的后期改性提供了一种环境友好且有效的替代方法。
Metal-free visible-light-initiated direct C3 alkylation of quinoxalin-2(1<i>H</i>)-ones and coumarins with unactivated alkyl iodides
作者:Jun Sun、Hua Yang、Bo Zhang
DOI:10.1039/d1gc03992j
日期:——
visible-light-promoted direct C3 alkylation of quinoxalin-2(1H)-ones and coumarinsusing readily accessible unactivated alkyl iodides as alkylation reagents. By applying this new approach, a broad range of valuable 3-alkylated quinoxalin-2(1H)-ones and coumarins (55 examples) can be facilely obtained at room temperature, thus showing the wide utility of this protocol. Notably, this practical reaction occurs under
我们首次报告了使用容易获得的未活化烷基碘作为烷基化试剂对喹喔啉-2(1 H )-酮和香豆素进行可见光促进的直接 C3 烷基化。通过应用这种新方法,可以在室温下轻松获得各种有价值的 3-烷基化 quinoxalin-2(1 H )-ones 和香豆素 (55 个例子),从而显示了该协议的广泛实用性。值得注意的是,这种实际反应发生在无金属和无外部光催化剂的条件下,表现出广泛的底物范围和高官能团耐受性。
An ultrastable olefin-linked covalent organic framework for photocatalytic decarboxylative alkylations under highly acidic conditions
作者:Miao Tian、Yichun Wang、Xiubin Bu、Yichen Wang、Xiaobo Yang
DOI:10.1039/d1cy00293g
日期:——
complexes and organic dyes. A wide range of alkylated heterocycles were selectively and efficiently synthesized under heterogeneous reaction conditions. Relying on the ultrastability of olefin linkage, 2D-COF-2 maintained its basic structure and photoactivity under highly acidicconditions. Moreover, its streamlining industrial potential was demonstrated in recycling experiments, functionalization of
Visible-Light-Induced C–H Bond Aminoalkylation of Heterocycles by the Decarboxylation Coupling of Amino Acids
作者:Yifan Li、Changhui Dai、Shentong Xie、Ping Liu、Peipei Sun
DOI:10.1021/acs.orglett.1c02014
日期:2021.8.6
An efficient visible-light-induced decarboxylative coupling reaction of N-protecting α-amino acids with heterocycles for the generation of aminoalkylated heterocycles is presented. A series of aminoalkylated heterocycles were obtained in moderate to good yields. Attractive features of this process include the generation of aminomethyl radical by an inexpensive organic photocatalyst under transition-metal-free