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.
Electrochemical synthesis of tetrazoles <i>via</i> metal- and oxidant-free [3 + 2] cycloaddition of azides with hydrazones
作者:Zenghui Ye、Feng Wang、Yong Li、Fengzhi Zhang
DOI:10.1039/c8gc02889c
日期:——
An unprecedented electrochemical [3 + 2] cycloaddition reaction for the synthesis of valuable tetrazoles was developed. Readily available azides and hydrazones were used as the starting materials under simple metal- and oxidant-free reaction conditions. Various functional groups are compatible with this green protocol which can be carried out on a gram-scale or in one pot easily.
Visible-light-promoted organic dye catalyzed perfluoroalkylation of hydrazones under mild conditions
作者:Ming-Dong Zhou、Zhen Peng、Lei Li、He Wang
DOI:10.1016/j.tetlet.2019.151124
日期:2019.10
A general and facile visible-light-promoted organic dye catalyzed perfluoroalkylation of hydrazones has been developed using inexpensive and non-toxic Eosin Y as the photoredox catalyst under mild conditions. This reaction protocol exhibits synthetic simplicity, broad scope of substrates, and excellent functional group compatibility. A gram scale synthesis can be also facilitated with a satisfactory
The electrochemical thiocyanation/cyclization of aldehyde hydrazones was developed under external oxidant‐free and catalyst‐free conditions. In contrast to previous thiocyanation, this electrosynthetic approach enabled a cascade C—H thiocyanation/cyclization through a mild, direct electrolysis manner in an undivided cell without the additive of halogens and stoichiometric oxidants. In this protocol