Rh2(II)-Catalyzed Nitro-Group Migration Reactions: Selective Synthesis of 3-Nitroindoles from β-Nitro Styryl Azides
摘要:
Rhodium carboxylate complexes (1 mol %) catalyze the migration of electron-withdrawing groups to selectively produce 3-substituted indoles from beta-substituted styryl azides. The relative order of migratorial aptitude for this transformation is ester << amide < H < sulfonyl < benzoyl << nitro.
A new and efficient method for the synthesis of 3-(2-nitrophenyl)pyruvic acid derivatives and indoles based on the Reissert reaction
作者:Vakhid A. Mamedov、Vera L. Mamedova、Victor V. Syakaev、Gul'naz Z. Khikmatova、Dmitry E. Korshin、Temur A. Kushatov、Shamil K. Latypov
DOI:10.1016/j.tetlet.2018.09.039
日期:2018.10
derivatives – key compounds for the Reissert indole synthesis – was achieved under various reaction conditions via the acid catalyzed hydrolysis of 5-(2-nitrobenzyliden)-2,2-dimethyl-1,3-oxazolidin-4-one, which is readily available from 3-(2-nitrophenyl)oxirane-2-carboxamide. A new and highly efficient method for the synthesis of indole-2-carboxylic acid derivatives via the intramolecular reductive cyclization
3-(2-硝基苯基)丙酮酸及其酰胺和酯衍生物的形成是Reissert吲哚合成的关键化合物,是通过酸催化的5-(2-硝基苄基)-2,2在各种反应条件下实现的。-二甲基-1,3-恶唑烷丁-4-酮,其可容易地从3-(2-硝基苯基)环氧乙烷-2-甲酰胺获得。利用Na 2 S 2 O 4在二恶烷/水中回流,开发了一种新的高效方法,该方法通过邻硝基苯基丙酮酸及其酰胺和酯衍生物的分子内还原环化反应合成吲哚-2-羧酸衍生物。
Divergent Synthesis of Indole-2-carboxylic Acid Derivatives via Ligand-free Copper-catalyzed Ullmann Coupling Reaction
effective (Table 1, entries 11, 18-20). At last, conducting the reaction at nitrogen atmosphere, the yield has no improvement obviously (Table 1, entry 21). The optimized condition was that CuI (10 mol%) and K2CO3 (1equiv.) in DMF under air atmosphere at 110 oC for 4 h, giving 2b in 70% yield (Table 1, entry 20). Table 1. Optimization of the reaction conditions for the synthesis of 1H-indole-2-carboxylic
[EN] BENZOPYRANYL HETEROCYCLE DERIVATIVES, PROCESS FOR PREPARATION THEREOF, AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM<br/>[FR] DERIVES HETEROCYCLIQUES DE BENZOPYRANYLE, METHODE DE PREPARATION DESDITS DERIVES ET COMPOSITIONS PHARMACEUTIQUES LES CONTENANT
申请人:DONGBU HANNONG CHEMICAL CO LTD
公开号:WO2002030925A1
公开(公告)日:2002-04-18
The present invention relates to novel benzopyranyl heterocycle derivatives, process for preparation thereof and pharmaceutical use of the benzopyranyl heterocycle derivatives. The benzopyranyl heterocycle derivatives of the present invention can be used for protecting heart, brain, retina and neuronal cell from 'ischemia-reperfusion' injury, treatment for diseases related to it and suppressing lipid peroxidation.
Organocatalytic Remote Stereocontrolled Synthesis of Tetrasubstituted Allenes via Asymmetric 1,8‐Addition of Propargylic Aza‐<i>p</i>‐Quinone Methides
作者:Zhibin Yue、Yan Xia、Boming Shen、Chang Liu、Peiyuan Yu、Pengfei Li、Wenjun Li
DOI:10.1002/adsc.202301286
日期:2024.3.8
An organocatalytic remote stereocontrolled 1,8-conjugated addition of in situ formed propargylic aza-p-quinone methides from α-(4-aminophenyl) propargylic alcohols and indole-2-carboxylates was developed, affording axially chiral tetrasubstituted allenes in 62-99% yield with 52-99% ee. The synthetic strategy not only enriches the chemistry of aza-p-quinone methides, but also provides an alternative