通过 Cu 催化 N-芳基化和 Wang 树脂/空气促进氧化环化策略制备 4-取代吡咯并[1,2-a]喹喔啉的声化学方法
摘要:
探索了4-取代的吡咯并[1,2- a ]喹喔啉框架来鉴定可能的 SIRT1 抑制剂。为了获得目标化合物,首次开发了通用的超声辅助两步方法,涉及铜催化的N -芳基化,然后是 Wang 树脂/空气促进的氧化环化策略。因此,2-碘苯胺与吡咯的CN偶联在第一步中得到1-(2-氨基苯基)吡咯衍生物,其与醛形成C N/C C键,得到所需产物。第二步在露天纯水中进行,并演示了 Wang 树脂催化剂的回收和再利用。该方法具有持续时间短、使用环保能源和更广泛的底物范围等优点。通过溴代产物的 Suzuki 偶联也证明了这种声化学方法的进一步应用。一些吡咯并[1,2- a ]喹喔啉类药物在体外对 SIRT1 表现出令人鼓舞的 (52-77%) 抑制作用(优于烟酰胺),并被确定为初始命中。
Benzotriazol-1-ylmethanol: An excellent bidentate ligand for the copper/palladium-catalyzed C-N and C-C coupling reaction
作者:Rajeev R. Jha、Jaspal Singh、Rakesh K. Tiwari、Akhilesh K. Verma
DOI:10.3998/ark.5550190.0014.219
日期:——
benzotriazole based N,O bidentate liga nds for the Cu-catalyzed N-arylation of πexcessive nitrogen heterocycles is described. This ligand accomplishes C-Ncoupling of Nheterocycles and C-Ccoupling of boronic acids with a variety of hindered, functionalized aryl/heteroaryl halides under mild reaction conditi ons in good to excellent yields. Using his ligandC-N and C-C (Suzuki) couplings with bromoarenes
描述了一种有效的基于苯并三唑的 N,O 双齿配体,用于铜催化的 π 过量氮杂环的 N-芳基化。该配体在温和的反应条件下以良好至极好的产率完成了杂环的 CN 偶联和硼酸与各种受阻的官能化芳基/杂芳基卤化物的 CC 偶联。使用他的配体 CN 和 CC (Suzuki) 与溴芳烃偶联可以在较少的催化剂负载下进行。一系列失活和受阻的芳基卤化物可以干净地反应,以高产率提供功能化的联芳基衍生物。
Lewis Acid-Catalyzed Selective Synthesis of Diversely Substituted Indolo- and Pyrrolo[1,2-a]quinoxalines and Quinoxalinones by Modified Pictet-Spengler Reaction
作者:Akhilesh K. Verma、Rajeev R. Jha、V. Kasi Sankar、Trapti Aggarwal、Rajendra P. Singh、Ramesh Chandra
DOI:10.1002/ejoc.201101013
日期:2011.12
An efficient tandem process for the selectivesynthesis of 1,2-annulated α-fused quinoxalines using benzotriazole methodology by a modifiedPictet–Spenglerreaction is described. The approach involves the reaction of arylamines 4 with aromatic aldehydes 5 to furnish 6-endo-dig-cyclized products. Dihydroquinoxalines 6 were selectively obtained by using AlCl3 in tetrahydrofuran (THF) at room temperature
2-(1-Benzotriazolyl)pyridine: A Robust Bidentate Ligand for the Palladium-Catalyzed CC (Suzuki, Heck, Fujiwara-Moritani, Sonogashira), CN and CS Coupling Reactions
作者:Akhilesh K. Verma、Rajeev R. Jha、Ritu Chaudhary、Rakesh K. Tiwari、Abhinandan K. Danodia
DOI:10.1002/adsc.201200583
日期:2013.2.1
designed and employed for the palladium-catalyzed CC (Suzuki, Heck, Fujiwara–Moritani, and Sonogashira), CN and CS coupling reactions. The ligand was found to be inexpensive, thermally stable, easy to synthesize from easily accessible starting materials on a multigram scale, show simplicity in use, and robustness in application, making this ligand effective for different coupling reactions. Suitably, the
设计了一种新型的双齿配体1-(吡啶-2-基)-1 H-苯并[ d ] [1,2,3]三唑,并用于钯催化的CC(Suzuki,Heck,Fujiwara– Moritani和Sonogashira),CN和CS偶联反应。发现该配体便宜,热稳定,易于以几克规模由容易获得的起始原料合成,显示出使用简单性和在应用中的坚固性,从而使该配体对于不同的偶联反应有效。适当地,苯并三唑环的NN键的供体能力和吡啶环的N上的孤对电子增强了配体的二齿能力。