intention for the analysis of such compounds. This study involved the synthesis of chalcones and their pyrazoline derivatives and their screening as cholinesterase inhibitors. The newly synthesized compounds were also investigated for their antioxidant potential. Methods: Chalcones were synthesized by well-established methods of synthesis and their structural elucidation was carried out by H-NMR, 13C-NMR
An efficient and green synthesis of benzo[4,5]imidazo[1,2-a]pyrimidines using highly active and stable poly acrylic acid-supported layered double hydroxides
facile and efficient method for the synthesis of benzo[4,5]imidazo[1,2-a]pyrimidines has been achieved via highlyactive and reusableheterogeneous poly acrylic acid-supported layered double hydroxides (PAA-g-LDHs) catalyst promoted one-pot reaction of 1H-benzo[d]imidazol-2-amine, with α,β-unsaturated carbonyl compounds under solvent-free conditions. PAA-g-LDHs catalyst was successfully synthesized via
通过促进高活性和可重复使用的非均相多聚丙烯酸负载的层状双氢氧化物(PAA- g -LDHs)催化剂的合成,已实现了一种简便高效的合成苯并[4,5]咪唑并[1,2- a ]嘧啶的方法1H-苯并[ d ]咪唑-2-胺与α,β-不饱和羰基化合物在无溶剂条件下的一锅反应。PAA- g ^通过接枝反应可逆加成-断裂链转移聚合成功合成了-LDHs催化剂,并通过不同的分析技术对其进行了表征。该反应的显着特征包括方便的一锅法,短反应时间,优异的收率,广泛的底物范围和操作简便性。同样,该催化剂可以重复使用几次连续运行而其催化活性没有任何明显的损失。
Methanol as a hydrogen source: room-temperature highly-selective transfer hydrogenation of α,β-unsaturated ketones
The described system offers an ideal, user-friendly protocol for the chemoselective homogeneous hydrogenation of α,β-unsaturatedketones at room temperature using methanol as a liquid organic hydrogen carrier. Excellent yields were achieved with an in situ-prepared phosphine-free Cp*Ir(III)/bipyridonate complex. Chemoselective reduction with other reducible functionalities and late-stage functionalization
所描述的系统为使用甲醇作为液态有机氢载体在室温下对α、β-不饱和酮进行化学选择性均相氢化提供了一种理想的、用户友好的协议。使用原位制备的无膦Cp*Ir( III )/联吡啶络合物获得了优异的产率。还探索了具有其他可还原功能和后期功能化的化学选择性还原。
Pyrazole–pyridine–pyrazole (NNN) ruthenium(<scp>ii</scp>) complex catalyzed acceptorless dehydrogenation of alcohols to aldehydes
作者:Yinyin Chen、Tianhua Cui、Hua Chen、Xue li Zheng、Haiyan Fu、Ruixiang Li
DOI:10.1039/d3dt01430d
日期:——
A new series of cationic ruthenium(II) complexes, [RuCl(PPh3)2(κ3-NNN-L1)]Cl (1), [RuH(PPh3)2(κ3-NNN-L2)]Cl (2), and [RuH(PPh3)2(κ3-NNN-L3)]Cl (3), bearing a 2,6-bis (1-R-5-methyl-pyrazol-3-yl) pyridine ligand (L1: R = H, L2: R = C6H4-p-CF3, L3: R = C6H4-p-OCH3), were synthesized and characterized with NMR, HRMS, and single-crystal X-ray diffraction. Their catalytic application was investigated in
一系列新的阳离子钌( II )配合物,[RuCl(PPh 3 ) 2 (κ 3 -NNN- L1 )]Cl ( 1 )、[RuH(PPh 3 ) 2 (κ 3 -NNN- L2 )]Cl ( 2 ) 和 [RuH(PPh 3 ) 2 (κ 3 -NNN- L3 )]Cl ( 3 ),带有 2,6-双 (1-R-5-甲基-吡唑-3-基) 吡啶配体 (合成了L1 : R = H、L2 : R = C 6 H 4 - p -CF 3、L3 : R = C 6 H 4 - p -OCH 3 ),并通过 NMR、HRMS 和单晶 X- 进行表征。射线衍射。研究了它们在伯醇无受体脱氢(AD)中的催化应用。配合物1对醛的选择性优于2和3,醛的收率高达99%,在温和条件下具有良好的官能团耐受性。此外,该反应唯一的副产物是氢气,可以作为清洁能源收集,符合环境友好化学的要求。配合物1也被证明是伯醇和仲醇之间连续
Merging Photocatalytic Doubly‐Decarboxylative C<sub>sp</sub><sup>2</sup>−C<sub>sp</sub><sup>2</sup> Cross‐Coupling for Stereo‐Selective (<i>E</i>)‐<i>α</i>,<i>β</i>‐Unsaturated Ketones Synthesis
作者:Subal Mondal、Siba P. Midya、Soumya Mondal、Suman Das、Pradyut Ghosh
DOI:10.1002/chem.202303337
日期:2024.1.26
cross-coupling reaction. Present catalytic system efficiently cross-coupled α, β-unsaturatedacids and α-keto acids to a variety of α, β-unsaturated ketones with excellent E-selectivity and functional group tolerance. In this merging catalysis, photocatalyst implicated through reductive quenching cycle whereas cross coupling proceeded over one electron oxidative pallado-cycle in a tandem pathway.