Process Intensification with Bifunctional Heterogeneous Catalysts: Selective One-Pot Synthesis of 2′-Aminochalcones
摘要:
2'-Aminochalcones of pharmaceutical and commercial interest have been obtained in high yields and selectivities through a one-pot process using a bifunctional heterogeneous catalyst bearing base and metal active sites. This is a physical mixture material formed by a high-surface-area MgO and Pt on TiO2. The process involves as the first step the Claisen-Schmidt condensation between o-nitroacetophenone and benzaldehyde derivatives on the basic catalytic function. This is followed by a chemoselective hydrogenation of the nitro group in the presence of the carbonyl and double-bond carbon carbon groups within the molecule. Using the bifunctional catalyst and the reaction system proposed here, it is possible to produce, under mild reaction conditions and short reaction times, 2'-aminochalcones with higher yields and selectivities than those obtained by conventional multistep methods.
The first Lewis acid-catalyzed intramolecular interrupted Nazarov cyclization of 1,4-pentadien-3-ols is described.
第一个由Lewis酸催化的1,4-戊二烯-3-醇分子内中断的Nazarov环化反应被描述了。
Straightforward Synthesis of Novel 4-Styrylquinolines/4-Styrylquinolin-2-ones and 9-Styryldihydroacridin-1(2H)-ones from Substituted 2′-Aminochalcones
作者:Alirio Palma、Angie Meléndez、Esteban Plata、Diego Rodríguez、Diana Ardila、Sergio A. Guerrero、Lina M. Acosta、Justo Cobo、Manuel Nogueras
DOI:10.1055/s-0039-1707985
日期:2020.6
approach, new series of these compounds were straightforwardly synthesized in high yields starting from synthetically available 2′-aminochalcones and 1,3-dicarbonyl compounds in glacial acetic acid as a catalyst via the Friedländer reaction. Our approach also offers an expeditious way to access novel molecular hybrids in whose structures styryl and chalcone fragments are attached at the C4 and C3 positions
for the synthesis of [1,4]thiazino[4,3-a]indole derivatives using sodium chlorodifluoroacetate (ClCF2CO2Na) and elemental sulfur as the difluoromethylthiolating reagent system has been developed. Three-component reactions of 2′-aminochalcones, sulfur, and ClCF2CO2Na under basic conditions using TEMPO as the oxidant afforded [1,4]thiazino[4,3-a]indol-10-ones containing a difluoromethyl thioether moiety
已经开发了一种使用氯二氟乙酸钠 (ClCF 2 CO 2 Na) 和元素硫作为二氟甲基硫醇化试剂系统合成 [1,4] 噻嗪并 [4,3- a ] 吲哚衍生物的有效方法。在碱性条件下,使用 TEMPO 作为氧化剂,2'-氨基查耳酮、硫和 ClCF 2 CO 2 Na 的三组分反应得到含有二氟甲基硫醚部分的[1,4] 噻嗪基 [4,3 - a ] 吲哚-10-酮收益良好。在顺序转化过程中选择性地形成四个键,包括一个 C-N、两个 C-S 和一个 C-C 键。
Synthesis and Reactivity of <i>o</i>
-Enoyl Arylisocyanides: Access to Phenanthridine-8-Carboxylate Derivatives
annulation with glutaconate to provide straightforward access to phenanthridine‐8‐carboxylates and hydrophenanthridine‐8‐carboxylates under mild aerobic conditions. In this domino transformation, two rings and three bonds were successively created. A mechanism involving tandem [3+3]‐annulation/intramolecularcyclization/ demethoxycarbonylation/aerobic oxidative aromatization sequence was proposed.
Brønsted Acid-Catalysed Allylic Amination of 1-(2-Aminoaryl)prop-2-en-1-ols to 1,2-Dihydroquinolines
作者:David Philip Day、Stuart Adam Henry、Yichao Zhao、Jianwen Jin、Guy James Clarkson、Philip Wai Hong Chan
DOI:10.1071/ch18191
日期:——
highly efficient synthetic method to prepare 1,2-dihydroquinolines that relies on trifluoromethanesulfonic acid (TfOH)-catalysed allylicamination of 1-(2-aminoaryl)prop-2-en-1-ols is described. Achieved at a catalyst loading of 0.01 mol-% under mild conditions at room temperature, the reaction was found to be robust, with a wide range of substitution patterns tolerated. The corresponding N-heterocyclic