self-sufficient transimination reaction between various types of C=N bonds in organic solvents, with turnover frequencies up to 3600 h(-)(1) and rate accelerations up to 6 x 10(5). The mechanism of the crossover reaction in mixtures of amines and imines is studied, comparing parallel individual reactions with coupled equilibria. The intrinsic kinetic parameters for isolated reactions cannot simply be added
Sc(OTf)(3) 有效地催化有机溶剂中各种类型的 C=N 键之间的自给转移反应,转换频率高达 3600 h(-)(1),速率加速高达 6 x 10(5 )。研究了胺和亚胺混合物中交叉反应的机理,比较了平行的单独反应与耦合平衡。当几种组分混合时,孤立反应的内在动力学参数不能简单地相加,并且系统的行为与构成竞争反应网络核心的独特介质的存在一致。在混合系统中,每个胺或亚胺根据它们对催化剂金属离子中心的结合亲和力竞争同一个中心枢纽。更普遍,
Simple and efficient approach for synthesis of hydrazones from carbonyl compounds and hydrazides catalyzed by meglumine
ABSTRACT A simple, environmentally benign protocol for synthesis of hydrazones from carbonyl compounds and hydrazides has been developed in the presence of meglumine in aqueous-ethanol media at room temperature. The salient features of the present protocol are mild reaction conditions, short reaction time, high yields, operational simplicity, metal-free, applicability toward large-scale synthesis, and biodegradable
<i>sp</i>
2-C-H Acetoxylation of Diversely Substituted (<i>E</i>
)-1-(Arylmethylene)-2-phenylhydrazines Using PhI(OAc)<sub>2</sub>
as Acetoxy Source at Ambient Conditions
作者:Goutam Brahmachari、Indrajit Karmakar
DOI:10.1002/ejoc.201900994
日期:2019.9.15
It's Simple! Catalyst‐ and additive‐free regioselective direct sp2 C–H acetoxylation of biologically interesting aldehyde hydrazones to access a new series of hydrazone acetates has been achieved. The reaction proceeds at ambient temperature employing PIDA as an acetoxy source.
I<sub>2</sub>/DMSO-Promoted Synthesis of Diaryl Sulfide- and Selenide-Embedded Arylhydrazones
作者:Arun Dhurey、Subhro Mandal、Animesh Pramanik
DOI:10.1021/acs.joc.2c02974
日期:2023.5.5
derivatization of arylhydrazones are important in pharmaceutical, medicinal, material, and coordination chemistry. In this regard, a facile I2/DMSO-promoted cross-dehydrogenative coupling (CDC) for direct sulfenylation and selenylation of arylhydrazones has been accomplished utilizing arylthiols/arylselenols at 80 °C. This method provides a metal-free benign route for the synthesis of a variety of arylhydrazones
芳基腙的功能化和衍生化在制药、医药、材料和配位化学中具有重要意义。在这方面,在 80 °C 下利用芳基硫醇/芳基硒醇完成了用于芳基腙直接硫化和硒基化的简便I 2 /DMSO 促进的交叉脱氢偶联 (CDC)。该方法为合成各种嵌入不同二芳基硫化物和硒化物部分的芳基腙提供了一种无金属的良性途径,收率从高到高。在该反应中,分子 I 2充当催化剂,DMSO 用作温和氧化剂和溶剂,通过 CDC 介导的催化循环生成多种硫基和硒基芳基腙。
Efficient Synthesis of Fully Substituted and Diversely Functionalized Pyrazoles through <i>p</i>‐TSA Catalyzed One‐Pot Condensation of Cyclic <i>β</i>‐Diketones, Arylglyoxals and Arylhydrazones
作者:Arun Dhurey、Subhro Mandal、Animesh Pramanik
DOI:10.1002/ejoc.202300770
日期:2023.10.21
An acid catalyzed one-pot condensation of readily available cyclic β-diketones, arylglyoxals and arylhydrazones produces a library of diverselyfunctionalized pyrazole derivatives in excellent yield under metal-catalyst-free benign conditions.