Oxidant-Controlled C-sp<sup>2</sup>/sp<sup>3</sup>–H Cross-Dehydrogenative Coupling of N-Heterocycles with Benzylamines
作者:Rohit Sharma、Mohd Abdullaha、Sandip B. Bharate
DOI:10.1021/acs.joc.7b00856
日期:2017.9.15
cross-dehydrogenative coupling (CDC) of benzylamines with N-heterocycles having sp2 or sp3 carbon resulted in the formation of C-benzoylated or alkenylated products. Benzoylation of N-heterocycles occurs via (NH4)2S2O8 catalyzed benzoyl radical formation. An oxidative alkenylation of N-heterocycles having C-sp3 carbon (2-methylaza-arenes) occurs via deamination of benzylamine followed by C-sp3-H bond activation
苄基胺与具有sp 2或sp 3碳的N-杂环的氧化剂控制的离子液体介导的交叉脱氢偶联(CDC)导致C-苯甲酰化或烯基化产物的形成。N-杂环的苯甲酰化是通过(NH 4)2 S 2 O 8催化的苯甲酰基基团形成的。具有C-sp 3碳的N-杂环(2-甲基氮杂芳烃)的氧化烯基化反应是通过苄胺的脱氨基反应,然后以高立体选择性进行C-sp 3 -H键活化而进行的。苯甲酰化和烯基化方案均不含金属,绿色,简单,有效,并且可耐受多种官能团。
Regiospecific Benzoylation of Electron-Deficient <i>N</i>-Heterocycles with Methylbenzenes via a Minisci-Type Reaction
作者:Wajid Ali、Ahalya Behera、Srimanta Guin、Bhisma K. Patel
DOI:10.1021/acs.joc.5b00501
日期:2015.6.5
coupling between electron-deficient N-heterocycles (isoquinoline, quinolines, and quinoxalines) and methylbenzenes leading to regiospecific C–aroylation has been accomplished using AlCl3 as the catalyst in the presence of oxidant TBHP. This protocol is a practical alternative to the classical Minisci reaction.
Nickel-catalyzed electrochemical Minisci acylation of aromatic N-heterocycles with α-keto acids via ligand-to-metal electron transfer pathway
作者:Hang Ding、Kun Xu、Cheng-Chu Zeng
DOI:10.1016/j.jcat.2019.10.030
日期:2020.1
A nickel-catalyzed electrochemical methodology for the Minisci acylation of aromatic electron-deficient heterocycles with α-keto acids has been developed. The reaction is performed in an undivided cell under constant current conditions, featuring broad scope of substrates and avoiding the conventional utilization of silver-based catalysts in conjunction with excess amount of oxidants. Cyclic voltammetric
Electrochemical Decarboxylative Minisci-Type Acylation of Quinoxalines under Catalyst- and External-Oxidant-Free Conditions
作者:Sen Liang、Kun Xu、Chengchu Zeng、Yongmei Li、Dehui Wang
DOI:10.1055/a-2147-2863
日期:2023.9
An electrochemical approach for the Minisci-type acylation of quinoxalines with α-keto acids as the acylradical precursors is reported. With the assistance of TFA as the key additive, acylated quinoxalines were constructed in synthetically useful yields. The distinguishable features of this electrochemical protocol include catalyst- and external oxidant-free conditions, and operational simplicity
2-Aroylquinoxalines (5, 6), 1-aroylphthalazines (10, 11), and 4-aroylcinnolines (13) were synthesized by using arenecarbaldehydes (2) in the presence of an azolium salt (1) in moderate to good yields. 1,3-Dimethylimidazolium iodide (1a) and sodium sulfinate (7) were also effective catalysts in this aroylation.