Specifically, the uncatalyzed imination of thiols or sulfinates proceeds with good yields, while under the mild reaction conditions offered by visiblelightphotoredoxcatalysis, the radical amination of hydrazones or the sulfoximidation of benzylic, allylic and propargylic C–H bonds takes place satisfactorily.
Visible Light‐Induced [3+2] Cyclization Reactions of Hydrazones with Hypervalent Iodine Diazo Reagents for the Synthesis of 1‐Amino‐1,2,3‐Triazoles
作者:Jun‐Ying Dong、He Wang、Shukuan Mao、Xin Wang、Ming‐Dong Zhou、Lei Li
DOI:10.1002/adsc.202001436
日期:2021.4.13
In this study, visible‐light‐induced [3+2] cyclization reactions of hydrazones with hypervalent iodine diazo reagents as diazomethyl radical precursors are reported. Mild reaction conditions, a broad substrate scope, and excellent functional group compatibility were observed. Furthermore, the synthetic utility was demonstrated by gram‐scale synthesis and elaboration to several value‐added products
A simple and highly efficient method for the oxo-sulfonylation of aldehyde-derived hydrazones has been developed using sulfinic acid as a source of sulfonyl group and oxygen as a green oxidant under metal-free conditions at room temperature. The present C–O and N–S bond-forming difunctionalization strategy affords diversely functionalized N-acylsulfonamides in good yield. Experimental results suggest
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.