range of quinazoline derivatives was fabricated with excellent yields using 0.5 mol% Pd(II) catalyst loading. The catalyticcoupling process was performed under aerobic conditions and water is the only by-product. With data from the control experiments, a plausible mechanism for the dehydrogenative coupling reaction was proposed via a cyclic aminal intermediate through the oxidation of alcohol to aldehyde
报道了一种新的钯 ( II ) N、N、O型配合物促进喹唑啉单锅级联合成,通过容易获得的醇和 2-氨基苄胺的脱氢偶联。一组独特的 Pd( II ) 配合物 ( 1-2 ) 被合成并通过分析和光谱技术表征。单晶 X 射线衍射研究证实了钯离子周围的方形平面几何形状。使用 0.5 mol% Pd( II) 催化剂负载。催化偶联过程在有氧条件下进行,水是唯一的副产品。与来自对照实验的数据,脱氢偶联反应的可行的机制,提出了通过环状缩醛胺中间体通过醇氧化成醛。克级合成证明了所提出协议的有效性。
Laccase-Based Oxidative Catalytic Systems for the Aerobic Aromatization of Tetrahydroquinazolines and Related N-Heterocyclic Compounds under Mild Conditions
Aerobicoxidative synthesis of quinazolines and other N‐heterocyclic aromatic compounds has been accomplished using O2/laccase/catechol (or TEMPO) as bioinspired catalytic oxidation system.
biomimetic aerobic oxidative synthesis of 2-substituted quinazolines and Hantzsch pyridines from the oxidative cyclocondensation of 2-aminobenzylamine and aldehydes and the oxidative aromatization of 1,4-dihydropyridines, respectively. The products were obtained in good to high yields in a phosphate buffer (0.1 M, 12.5 mL, pH 4.5) and acetonitrile (4 vol%) mixture as a solvent. These methods are more
BTP‐Rh@g‐C
<sub>3</sub>
N
<sub>4</sub>
as an efficient recyclable catalyst for dehydrogenation and borrowing hydrogen reactions
作者:Lan Luo、Hongqiang Liu、Wei Zeng、Wenkang Hu、Dawei Wang
DOI:10.1002/aoc.6504
日期:2022.2
Highly active catalysts play an important role in modern catalysis. A novel and efficient ligand benzotriazole-pyrimidine (BTP) and the corresponding rhodium composite on C3N4 were successfully synthesized. The resulting rhodium composite was fully characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), thermogravimetric analysis (TGA),
高活性催化剂在现代催化中发挥着重要作用。C 3 N 4上新型高效配体苯并三唑-嘧啶 (BTP) 和相应的铑复合物合成成功。得到的铑复合材料通过扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、X 射线衍射 (XRD)、热重分析 (TGA) 和 X 射线光电子能谱 (XPS) 进行了全面表征。所得复合物在2-氨基苄醇和苄腈合成喹喔啉中表现出良好的催化活性和良好的回收性能,以良好收率得到20多种喹喔啉。此外,还表明,通过借氢策略,铑复合材料在功能化酮的合成中具有良好的催化性能。
NNN pincer Ru(II)-catalyzed dehydrogenative coupling of 2-aminoarylmethanols with nitriles for the construction of quinazolines
作者:Xiao-Min Wan、Zi-Lin Liu、Wan-Qing Liu、Xiao-Niu Cao、Xinju Zhu、Xue-Mei Zhao、Bing Song、Xin-Qi Hao、Guoji Liu
DOI:10.1016/j.tet.2019.03.046
日期:2019.5
Ru(II)-catalyzed preparation of quinazolines via acceptorless dehydrogenative strategy has been developed. Under the optimized conditions, a broad range of substituted o-aminobenzyl alcohols and (hetero)aryl or alkyl nitriles were well tolerated to afford various 2-substituted quinazolines in high yields. Subsequently, a set of control experiments have been performed to elucidate the reaction mechanism,