Cooperative iridium complex-catalyzed synthesis of quinoxalines, benzimidazoles and quinazolines in water
作者:Kaushik Chakrabarti、Milan Maji、Sabuj Kundu
DOI:10.1039/c8gc03744b
日期:——
Herein, an efficient methodology for the synthesis of a diverse class of N-heterocyclic moieties, such as quinoxalines, benzimidazoles and quinazolines, was developed in water using bio-renewable alcohols. The quinoxalines were successfully synthesized from a wide range of diamines and nitroamines with diols in air. Interestingly, benzimidazoles and quinazolines were synthesized with excellent isolated
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。
Iron-catalyzed cascade reaction of 2-aminobenzyl alcohols with benzylamines: synthesis of quinazolines by trapping of ammonia
作者:Kovuru Gopalaiah、Anupama Saini、Alka Devi
DOI:10.1039/c7ob01159h
日期:——
A novel approach to construct 2-aryl/heteroaryl quinazolines was developed through iron-catalyzed cascade reaction of 2-aminobenzyl alcohols with benzylamines under aerobic oxidative conditions. The reaction proceeds via the formation of N-benzylidenebenzylamines followed by oxidative trapping of ammonia/intramolecular cyclization in a one-pot manner. The method exhibits a broad substrate scope, high
Sustainable Synthesis of Quinazoline and 2-Aminoquinoline via Dehydrogenative Coupling of 2-Aminobenzyl Alcohol and Nitrile Catalyzed by Phosphine-Free Manganese Pincer Complex
A sustainable synthesis of quinazoline and 2-aminoquinoline via acceptorless dehydrogenative annulation is presented. The reaction is catalyzed by earth-abundant well-defined manganese complexes bearing NNS ligands. Furthermore, a one-pot synthetic strategy for the synthesis of 2-alkylaminoquinolines through sequential dehydrogenative annulation and N-alkylation reaction has also been demonstrated
K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>-mediated coupling of 6-amino-7-aminomethyl-thiazolino-pyridones with aldehydes to construct amyloid affecting pyrimidine-fused thiazolino-2-pyridones
作者:Jaideep B. Bharate、Jörgen Ådén、Anna Gharibyan、Dan E. Adolfsson、Sanduni Wasana Jayaweera、Pardeep Singh、Katarina Vielfort、Mohit Tyagi、Mari Bonde、Sven Bergström、Anders Olofsson、Fredrik Almqvist
DOI:10.1039/d1ob01580j
日期:——
We herein present the synthesis of diversely functionalized pyrimidine fused thiazolino-2-pyridones via K2S2O8-mediated oxidative coupling of 6-amino-7-(aminomethyl)-thiazolino-2-pyridones with aldehydes.