描述了一系列含有可转移重氮甲基的锍盐的一锅法合成,并通过 X 射线晶体学阐明了这些化合物的结构。在光化学条件下,这些盐与N , N -二烷基腙反应,通过重氮甲基自由基加成到偶氮甲碱碳上,然后进行分子内闭环,得到 1-(二烷基氨基)-1,2,3-三唑。还报道了由此获得的结构直接转变为介离子卡宾-金属配合物,并表征了这些新配体的供体性质。
Copper-Catalyzed C(sp<sup>2</sup>)–H Difluoroalkylation of Aldehyde Derived Hydrazones with Diboron as Reductant
作者:Miaolin Ke、Qiuling Song
DOI:10.1021/acs.joc.6b00324
日期:2016.5.6
An efficient and general method for C(sp2)–Hdifluoroalkylation of aldehyde derived hydrazones via a CuII/B2pin2-catalyzed reaction between difluoroalkylbromides and hydrazones was developed. In this reaction, both aromatic and aliphatic difluoroalkylated aldehyde derived hydrazones could be achieved in good to excellent yields. For some heteroaromatic aldehyde derived hydrazones, two fluoroacetates
通过Cu II / B 2 pin 2催化的二氟烷基溴与的反应,开发了一种有效且通用的醛衍生的C(sp 2)-H二氟烷基化方法。在该反应中,芳族和脂族二氟烷基化醛衍生的azo均可以良好至优异的产率获得。对于某些杂芳族醛衍生的azo,可以将两种氟乙酸酯引入最终产物中。初步的机理研究表明,通过SET途径的二氟烷基自由基参与了反应。另外,催化二硼试剂在该转化中起着不可或缺的作用。
Gold-Catalyzed Highly Selective Photoredox C(sp<sup>2</sup>
)−H Difluoroalkylation and Perfluoroalkylation of Hydrazones
作者:Jin Xie、Tuo Zhang、Fei Chen、Nina Mehrkens、Frank Rominger、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/anie.201508622
日期:2016.2.18
hydrazones are highly functionalized, versatile molecules. A mild reduction of the coupling products can efficiently produce gem‐difluoromethylated β‐amino phosphonic acids and β‐amino acid derivatives. In mechanistic studies, a difluoroalkyl radical intermediate was detected by an EPR spin‐trappingexperiment, indicating that a gold‐catalyzed radical pathway is operating.
据报道,使用容易获得的R F -Br试剂,gold的金催化光氧化还原C(sp 2)-H二氟烷基化和hydr的全氟烷基化。所得的宝石二氟甲基化和全氟烷基化的azo是高度官能化的多用途分子。偶合产物的轻度减少可以有效地生产出宝石-二氟甲基化的β-氨基膦酸和β-氨基酸衍生物。在机理研究中,通过EPR自旋捕获实验检测到二氟烷基自由基中间体,表明金催化的自由基途径正在起作用。
Transition-Metal-Free Trifluoromethylation of Aldehyde Derivatives with Sodium Trifluoromethanesulfinate
A metal-free and cost-effective synthetic protocol for the trifluoromethylation of N,N-disubstituted hydrazones with Langlois’s reagent (CF3SO2Na) to afford the corresponding functionalized trifluoromethyl ketone hydrazones has been established. It is proposed that a radical/SET mechanism proceeding via a trifluoroalkyl radical may be involved in the reaction. Applications of the methodology in industry
已经建立了一种无金属且具有成本效益的合成方案,用于使用Langlois试剂(CF 3 SO 2 Na)对N,N-二取代进行三氟甲基化,以提供相应的官能化三氟甲基酮。建议通过三氟烷基自由基进行的自由基/ SET机理可能参与该反应。我们将发现该方法在工业中的应用,并将继续在我们的实验室中开发使用Langlois试剂进行三氟甲基化的新方法。
Dioxygen-Triggered Oxo-Sulfonylation of Hydrazones
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
Electrochemical Oxidative C(sp<sup>2</sup>)–H Amination of Aldehyde Hydrazones with Azoles
作者:Zhi-Mei Fu、Jian-Shan Ye、Jing-Mei Huang
DOI:10.1021/acs.orglett.2c01782
日期:2022.8.19
A general and highly efficient method for the electrochemical C(sp2)–Hamination of aldehyde hydrazones with azoles has been developed. This reaction proceeds under exogenous metal-, catalyst-, and oxidant-free conditions to provide aminated hydrazone derivatives in good to excellent yields. This strategy applies to both aromatic and aliphatic aldehyde hydrazones and tolerates a broad range of functional