已经报道了一种合成1,5-和1,4,5-取代的1,2,3-三唑的新方法。使用烯胺和N-甲苯磺酰肼作为原料的碘-TBHP氧化系统促进了这种方法,避免了传统方法对叠氮化物和过渡金属的依赖。通过这种方法,各种1,5-和1,4,5-取代的1,2,3-三唑以中等到高产量提供。机理研究表明,氨基交换将参与反应过程。此外,产品1-(2-甲氧基苯基)-4-甲基-1 H -1,2,3-三唑-5-羧酸甲酯是抗甲型流感药物的有用前体,并进行了进一步的应用研究。
A facile one-pot domino reaction for the stereoselective synthesis of acryl derivatives promoted by Ca(OTf)2
作者:Srinivasarao Yaragorla、Pyare Lal Saini、Abhishek Pareek、Abdulrahman I. Almansour、Natarajan Arumugam
DOI:10.1016/j.tetlet.2016.03.098
日期:2016.5
A facile one-pot domino reaction for the stereoselectivesynthesis of acryl derivatives has been reported using alkaline earth catalyst [Ca(OTf)2]. Initially aryl amine reacts with ethyl propiolate to form β-enamino ester which further reacts with aryl aldehyde and indole in the presence of Ca(OTf)2 to give indolyl acrylates. It is interesting to note that in the absence of indole the reaction leads
One-pot synthesis of 6,11-dihydro-5H-indolizino[8,7-b]indoles via sequential formation of β-enamino ester, Michael addition and Pictet–Spengler reactions
作者:Dan Zhu、Jing Sun、Chao-Guo Yan
DOI:10.1039/c4ra10355f
日期:——
les in the presence of anhydrous ZnCl2 to give functionalized 2-pyrrolo-3′-yloxindoles in satisfactory yields, which can be further converted to the corresponding 6,11-dihydro-5H-indolizino[8,7-b]indoles in good yields through a CF3SO3H catalyzed Pictet–Spengler cyclization process. Under similar conditions, when arylamines were used to replace tryptamine, the one-pot domino reaction afforded the functionalized
在无水ZnCl 2存在下,通过将色胺加到丙酸烷基酯中而生成的β-烯氨基酯与3-苯并亚甲基吲哚反应,以令人满意的收率得到官能化的2-吡咯并3'-yloxindole,可以将其进一步转化为相应的6,11通过CF 3 SO 3 H催化的Pictet-Spengler环化过程,可以使-dihydro -5 H -indolizino [8,7- b ]吲哚获得高收率。在相似的条件下,当使用芳基胺代替色胺时,一锅多米诺反应提供了功能化的2-吡咯基-3'-羟基吲哚。
Three-Component Synthesis of Quinolines Based on Radical Cascade Visible-Light Photoredox Catalysis
作者:Jun-Ho Choi、Cheol-Min Park
DOI:10.1002/adsc.201800734
日期:2018.9.17
Synthesis of highly substituted quinolines has been developed based on three‐component radicalcascadebased on visible‐light photoredoxcatalysis. This tandem coupling reaction has been coordinated to proceed with high chemoselectivity based on the differential electronic properties of coupling partners. Subjection of electron‐rich β‐aminoacrylates with electron‐deficient halides and alkenes to the
Formation of 1,2-Dihydroquinoline-3-carboxylic Acid Derivatives from Methyl 3-(Arylamino)acrylates with Hydrogen Iodide
作者:Shoji Matsumoto、Takahiro Mori、Motohiro Akazome
DOI:10.1055/s-0030-1258229
日期:2010.11
The reaction of methyl 3-(arylamino)acrylates with hydrogen iodide gave 1,2-dihydroquinoline-3-carboxylic acid derivatives at room temperature. This reaction proceeds efficiently in alcoholic solvent; bulky tert-butyl alcohol is the best solvent to give the 1,2-dihydroquinoline derivatives. It is particularly interesting that hydrogen iodide is the most efficient acid to achieve this reaction in tert-butyl
Synthesis of Functionalized 2-Aminohydropyridines and 2-Pyridinones via Domino Reactions of Arylamines, Methyl Propiolate, Aromatic Aldehydes, and Substituted Acetonitriles
作者:Jing Sun、Yan Sun、Er-Yan Xia、Chao-Guo Yan
DOI:10.1021/co200071v
日期:2011.7.11
An efficient and practical synthetic method for the functionalized 2-amino hydropyridines and 2-pyridinones was successfully developed via the domino reactions of arylamines, methyl propiolate, aromatic aldehydes and the substituted acetonitriles with triethylamine as base catalyst. Reactions involving malononitrile and cyanoacetamide gave exclusively the 2-aminohydropyridines. On the other hand ethyl cyanoacetate resulted in the 2-pyridinones as main products.