amidation of indoles under mild reaction conditions is developed. This methodology affords various indole fused tetracyclic compounds, such as benzo[4,5]imidazo[1,2-a]indoles by intramolecular C2 amidation of N-aryl substituted indoles. This C2 sulfonamidative cyclization also offers convenient access to indolo[2,3-b]indoles and dihydroindolo[2,3-b]quinoline from C3 aryl substituted indoles in good to excellent
在温和的反应条件下,开发了一种新颖且无金属的I 2介导的吲哚分子内C2酰胺化反应。该方法通过N-芳基取代的吲哚的分子内C 2酰胺化而得到各种吲哚稠合的四环化合物,例如苯并[4,5]咪唑并[1,2- a ]吲哚。这种C2磺酰胺化环化反应还可以方便地从C3芳基取代的吲哚获得吲哚[2,3- b ]吲哚和二氢吲哚[2,3- b ]喹啉,收率良好。吲哚[2,3- b ]喹啉还可以通过多米诺环化-脱甲苯磺酸化-芳香化反应序列合成。
Efficient total synthesis of neocryptolepine and synthetic access to 6-methylquinindoline from a common intermediate
作者:María V. Méndez、Daniel A. Heredia、Enrique L. Larghi、Andrea B. J. Bracca、Teodoro S. Kaufman
DOI:10.1039/c7ra05349e
日期:——
A convenient approach toward the indoloquinolines neocryptolepine and 6-methylquinindoline from a common intermediate, is reported. Both sequences, designed for maximum use of accessible reagents and robust conditions, are straightforward and efficient. They involved the amidation of 2-aminobenzaldehyde (prepared by iron-mediated reduction of 2-nitrobenzaldehyde) with 2-nitrophenylacetic acid, followed
据报道,从常见的中间体向吲哚喹啉新隐油菜碱和6-甲基喹啉有一种简便的方法。两种序列均旨在最大程度地利用可及的试剂和稳定的条件,因此既简单又有效。他们涉及用2-硝基苯基乙酸酰胺化2-氨基苯甲醛(通过铁介导的还原2-硝基苯甲醛制备),然后用K 2 CO 3辅助环化形成3-(2-硝基苯基)喹啉-2-一个作为共同的先驱。Me 2 CO 3介导的内酰胺的N-甲基化,硝基部分的还原和最终环化导致新隐油菜籽的总收率为55%,而环缩合和N-甲基化得到6-甲基喹啉的总产率为79%。因此,朝向靶标的序列需要进行两次POCl 3促进的C–N键形成反应,两次Fe介导的硝基还原和两次碱基促进的转化。
Original and Rapid Access to New Alkaloid Analogues of Neocryptolepine: Synthesis of Substituted 6-Methyl-6<i>H</i>-indolo[2,3-<i>b</i>]quinolines via TDAE Strategy
作者:Patrice Vanelle、Ouassila Amiri-Attou、Thierry Terme
DOI:10.1055/s-2005-921916
日期:——
We report herein an original and rapid synthesis of new substituted 6H-indolo[2,3-b]quinolines based on TDAE strategy from reaction between substituted o-nitrobenzyl chlorides and 1-methyl isatin followed by a one-pot reduction-cyclization-dehydration reaction.
An efficient iron-promoted synthesis of 6H-indolo[2,3-b]quinolines and neocryptolepine derivatives
作者:Zicong Yan、Changfeng Wan、Jianyong Wan、Zhiyong Wang
DOI:10.1039/c6ob00469e
日期:——
A facile and practical method for the preparation of 6H-indolo[2,3-b]quinolines and neocryptolepines was developed under the promotion of the easily available ferric trichloride, affording the desired products with moderate to good yields.
在容易获得的三氯化铁的促进下,开发了一种简便实用的制备6 H-吲哚并[2,3- b ]喹啉和新隐油菜碱的方法,从而以中等至良好的收率提供了所需的产物。
Synthesis of Indolo- and Benzothieno[2,3-<i>b</i>]quinolines by a Cascade Cyclization of <i>o</i>-Alkynylisocyanobenzene Derivatives
A new synthetic approach for the synthesis of indolo[2,3-b]quinolines and benzothieno[2,3-b]quinolines has been developed by employing the freshly prepared o-alkynylisocyanobenzenes derived from o-alkynylformamide derivatives as substrates. The synthetic transformations involved chloride-ion-triggered 6-endo cyclization of o-alkynylisocyanobenzenes to generate 2-chloroquinolines in situ, which further