selective conversion of cyclohexanone oximes to primary anilines would be a good complement to the classical synthetic methods for primary anilines, which utilize arenes as the starting materials, there have been no general and efficient methods for the conversion of cyclohexanone oximes to primary anilines until now. In this study, we have successfully realized the efficientconversion of cyclohexanone
The synthesis of anilines and indolesfrom cyclohexanones using a Pd/C–ethylene system is reported. A simple combination of NH4OAc and K2CO3 under nonaerobic conditions was found to be the most suitable to perform this reaction. Hydrogen transfer between cyclohexanone and ethylene generates the desired products. The reaction tolerates a variety of substitutions on the starting cyclohexanones.
据报道,使用Pd / C-乙烯系统可从环己酮合成苯胺和吲哚。发现在无氧条件下简单的NH 4 OAc和K 2 CO 3组合最适合进行该反应。环己酮和乙烯之间的氢转移产生了所需的产物。该反应可耐受起始环己酮上的各种取代。
Selective Synthesis of Primary Anilines from NH
<sub>3</sub>
and Cyclohexanones by Utilizing Preferential Adsorption of Styrene on the Pd Nanoparticle Surface
Dehydrogenative aromatization is one of the attractive alternative methods for directly synthesizing primary anilines from NH3 and cyclohexanones. However, the selectivesynthesis of primary anilines is quite difficult because the desired primary aniline products and the cyclohexanone substrates readily undergo condensation affording the corresponding imines (i.e., N‐cyclohexylidene‐anilines), followed
Selective primary aniline synthesis through supported Pd-catalyzed acceptorless dehydrogenative aromatization by utilizing hydrazine
作者:Wei-Chen Lin、Takafumi Yatabe、Kazuya Yamaguchi
DOI:10.1039/d1cc01686e
日期:——
hydroxyapatite-supported Pd nanoparticle catalyst (Pd/HAP), various primary anilines can be selectively synthesized from cyclohexanones via acceptorless dehydrogenative aromatization. The strong nucleophilicity of N2H4 and the stability of the hydrazone intermediates can effectively suppress the formation of the undesired secondary aniline byproducts.
通过在羟基磷灰石负载的 Pd 纳米颗粒催化剂 (Pd/HAP) 存在下利用肼 (N 2 H 4 ) 作为氮源,可以通过无受体脱氢芳构化从环己酮选择性地合成各种伯苯胺。N 2 H 4的强亲核性和腙中间体的稳定性可以有效抑制不需要的次级苯胺副产物的形成。
Saegusa Oxidation of Enol Ethers at Extremely Low Pd-Catalyst Loadings under Ligand-free and Aqueous Conditions: Insight into the Pd(II)/Cu(II)-Catalyst System
作者:Quan Zhu、Yunsong Luo、Yongyan Guo、Yushun Zhang、Yunhai Tao
DOI:10.1021/acs.joc.0c02987
日期:2021.4.16
system of Saegusa oxidation, which converts enolethers to the corresponding enals with a number of diverse substrates at extremely low catalyst loadings (500 mol ppm) under ligand-free and aqueous conditions, is described. Its synthetic utility was demonstrated by large-scale applications of the catalyst system to important nature molecules. This work allows Saegusa oxidation to become a highly practical