Recyclable palladium-catalyzed carbonylative annulation of 2-iodoanilines with acid anhydrides: A practical synthesis of 2-alkylbenzoxazinones
作者:Zebiao Zhou、Bin Huang、Mingzhong Cai
DOI:10.1080/00397911.2021.1966039
日期:2021.10.18
highly efficient heterogeneous palladium-catalyzedcarbonylative annulation of 2-iodoanilines and acidanhydrides has been developed. The reaction proceeds effectively in toluene using N,N-diisopropylethylamine (DiPEA) as the base at 100 °C under 2 bar of CO and provides a novel, general, and practical method for the assembly of a wide variety of 2-alkylbenzoxazinones with high functional group tolerance
摘要 已经开发了一种高效的多相钯催化的 2-碘苯胺和酸酐的羰基化环化。该反应在甲苯中使用N,N-二异丙基乙胺 (DiPEA) 作为碱在 100 °C 和 2 bar CO 下有效进行,为组装各种具有高官能团耐受性和良好的收率。这种负载的钯配合物可以很容易地从产物中分离出来,并通过反应溶液的简单过滤进行回收,并以几乎一致的催化效率重复使用多达七次。
A General Palladium-Catalyzed Carbonylative Synthesis of 2-Alkylbenzoxazinones from 2-Bromoanilines and Acid Anhydrides
作者:Xiao-Feng Wu、Helfried Neumann、Matthias Beller
DOI:10.1002/chem.201202142
日期:2012.10.1
(C), its (O)K! An efficient palladium‐catalyzed carbonylativesynthesis of 2‐alkylbenzoxazinones has been developed (see scheme). By starting from 2‐bromoanilines and acidanhydrides, the corresponding products were isolated in good yields.
The series of vasicine ( 1 ) analogues, an alkaloid from Adhatoda vasica Nees., were synthesized with changes in A, B or C rings. Compounds 13-19 were evaluated for in vitro bronchodilatory activity using isolated guinea pig tracheal chain. Compounds 3-8 were also synthesized in good yields using microwave-mediated synthesisundersolventfreeconditions. Compounds 5 and 8 with seven-member C ring
Microwave Assisted Synthesis and Molecular Docking Studies of Some 4-(3H)-quinazolinone Derivatives as Inhibitors of Human Gamma-Aminobutyric Acid Receptor, the GABA (A)R-BETA3 Homopentamer
作者:Rakesh Devidas Amrutkar、Mahendra Sing Ranawat
DOI:10.2174/1573406416666191216121442
日期:2021.5.24
efficient method for the synthesis of 3-substituted-2- propyl-quinazolin-4-one by the condensation reaction of anthranilic acid or halogen substituted anthranilic acid or methyl anthranilate, butanoic anhydride with various amines. We also report a drug/ligand or receptor/protein interactions by identifying the suitable activesites in the human gamma-aminobutyric acid receptor, the gaba (a)r-beta3 homopentamer
背景:喹唑啉和喹唑啉酮构成了一类主要的生物活性分子,包括天然和合成来源。喹唑啉酮部分是一种重要的药效团,显示出许多类型的药理活性,如最近对 2-杂芳基和杂烷基-4-喹唑啉酮 4-喹唑啉酮(邻氨基苯甲酸和酰胺的正式缩合产物)的化学的详尽综述所示。它们也可以通过 Niementowski 喹唑啉酮合成以这种方式制备,该合成以其发现者 Stefan Niementowski 的名字命名。喹唑啉和缩合喹唑啉表现出有效的中枢神经系统 (CNS) 活性,如抗焦虑、镇痛、抗炎和抗惊厥。据报道,Quinazolin-4- 具有 2, 3-二取代具有显着的镇痛作用, 方法:为了扩展这些观点和应用概况,通过取代环中的 O 原子将不同的胺并入合成的苯并恶嗪酮环中,已经努力合成一类新的喹唑啉酮。迄今为止,在过去的几年中,人们提出了大量不同的合成喹唑啉-4-酮的方法。使用微波辐射,该反应可以以非常好的产率轻松快速地进行,提供大量各种
Synthesis of a Novel Series of 2,3-Disubstituted Quinazolin-4(3H)-ones as a Product of a Nucleophilic Attack at C(2) of the Corresponding 4H-3,1-Benzoxazin-4-one
作者:Mahr A. El-Hashash、Yaser A. El-Badry
DOI:10.1002/hlca.201000230
日期:2011.3
A new series of 2,3‐disubstituted quinazolin‐4(3H)‐one derivatives was synthesized by nucleophilicattack at C(2) of the corresponding key starting material 2‐propyl‐4H‐3,1‐benzoxazin‐4‐one (Scheme 2). The reaction proceeded via amidinium salt formation (Scheme 3) rather than via an N‐acylanthranilimide. The structure of the prepared compounds were elucidated by physical and spectral data like FT‐IR
通过亲核攻击相应关键起始原料2-丙基-4 H -3,1-苯并恶嗪-4-的C(2)合成了一系列新的2,3-二取代的喹唑啉-4(3 H)-one衍生物。一(方案2)。进行该反应经由脒鎓盐的形成(方案3),而不是通过一个Ñ -acylanthranilimide。FT-IR,1 H-NMR和质谱等物理和光谱数据阐明了所制备化合物的结构。