products, and one‐pot syntheses. Mechanistic analyses and theoretical calculations indicate that this reaction is enabled by a novel aminylradical/polar crossover mechanism, with the aminylradical being oxidized into the corresponding aminyl cation through a single electrontransfer (SET) process.
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
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
An ammonium persulfate mediated thiocyanation reaction of aldehyde‐derived hydrazones that affords 5‐thioxo‐1,2,4‐triazoliuminnersalts has been developed. The operational simplicity, mild and metal‐free reaction conditions performed at ambient temperature, wide functional group tolerance, and scalability of the process are key features of this method.
Oxidative C(sp<sup>2</sup>)–H Phosphonation of Aldehyde Hydrazones
作者:Pan Xu、Zhongkai Wu、Nengneng Zhou、Chengjian Zhu
DOI:10.1021/acs.orglett.6b00257
日期:2016.3.4
A K2S2O8/Cu(OAc)2-mediated oxidative C–H/P–H cross-coupling of aldehyde hydrazones with diphenylphosphine oxide for the direct preparation of functionalized α-iminophosphine oxides is reported. The reaction shows good functional group tolerance and proceeds smoothly under mild conditions. This strategic protocol for C–P bond formation is facilitated by a net oxidative aminyl radical–polar crossover
据报道,AK 2 S 2 O 8 / Cu(OAc)2介导的乙与二苯基膦氧化物的氧化C–H / P–H交叉偶联可直接制备官能化的α-亚氨基膦氧化物。该反应显示出良好的官能团耐受性,并且在温和条件下平稳进行。净氧化性胺基自由基-极性交叉过程促进了C-P键形成的这一战略方案。