Oxidative Sulfonylation of Hydrazones Enabled by Synergistic Copper/Silver Catalysis
作者:Jun Xu、Chao Shen、Xian Qin、Jie Wu、Pengfei Zhang、Xiaogang Liu
DOI:10.1021/acs.joc.0c02249
日期:2021.3.5
A copper/silver-cocatalyzed protocol for oxidative sulfonylation of hydrazones is demonstrated. A wide range of β-ketosulfones and N-acylsulfonamides are directly synthesized in moderate to good yields. Our work provides a viable method for scalable preparation of β-ketosulfone derivatives that have found wide applications in the pharmaceutical industry.
Cu‐Catalyzed C(sp
<sup>2</sup>
−H)‐Trifluoromethylation of Aldehyde Hydrazones with Langlois Reagent
作者:Jatin Mehta、Puspa Aryal、V. Prakash Reddy
DOI:10.1002/ejoc.202100205
日期:2021.4.8
The C(sp2−H)‐trifluoromethylation of aromatic aldehyde N‐aminomorpholine hydrazones has been achieved under free‐radical conditions through Cu(II) catalysis using the cost‐effective Langlois reagent (sodium trifluoromethanesulfinate). The reaction tolerates a series of electron‐releasing as well as electron‐withdrawing substituents on the aromaticring.
Acetic acid-promoted photoredox catalyzed trifluoromethylation of aldehyde hydrazones
作者:Puspa Aryal、Raheemat Rafiu、V. Prakash Reddy
DOI:10.1016/j.jfluchem.2022.110003
日期:2022.9
Radical C(sp2)-H trifluoromethylation of aromaticaldehydehydrazones is achieved in moderate to high yields under oxidative photoredox catalysis conditions, using inexpensive, bench-stable sodium trifluoromethanesulfinate (Langlois reagent), and Rose Bengal (RB) as the photocatalyst in the presence of acetic acid as the promoter. Acetic acid accelerates the rates of trifluoromethylation reactions
Transition-metal-free electrochemical oxidative C(sp<sup>2</sup>)–H trifluoromethylation of aryl aldehyde hydrazones
作者:Yuan Shi、Kai Wang、Yuxin Ding、Yuanyuan Xie
DOI:10.1039/d2ob01734b
日期:——
A simple protocol of metal-free C–H trifluoromethylation of hydrazones via electrolysis was developed. This environment-friendly transformation showed high efficiency, good tolerance, and scaled-up functionalization, providing the desired products in moderate to good yields. At the same time, a high yield can be obtained for the substrates either bearing an electron-donating group or an electron-withdrawing