Enantioselective vinylogous Michael addition of β,γ-unsaturated butenolide to 2-iminochromenes
作者:Vijay Gupta、Ravi P. Singh
DOI:10.1039/c9nj01584a
日期:——
An efficient organocatalyzed asymmetric synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles via vinylogous Michael addition of non-activated β,γ-unsaturated butenolide to 2-iminochromenes has been realized.
A Simple Efficient Procedure for the Synthesis of Benzopyrano[2,3-<i>c</i>]pyrazoles
作者:H. Turki、M. Kamoun、S. Lahiani、R. El Gharbi
DOI:10.1002/jhet.1759
日期:2016.9
A one‐step procedure is proposed for synthesizing 2‐acyl benzopyrano[2,3‐c]pyrazoles and 2‐aryl benzopyrano[2,3‐c]pyrazoles. The method is based on the condensation of 2‐iminocoumarin‐3‐carbonitriles with hydrazides and hydrazines in acid as catalysts. A mechanism of reaction is proposed. All prepared compounds are identified by FTIR, 1H NMR, 13C NMR, mass spectroscopy, and elemental analysis.
提出了一种一步法合成2-酰基苯并吡喃并[2,3- c ]吡唑和2-芳基苯并吡喃并[2,3- c ]吡唑。该方法基于2-亚氨基香豆素-3-腈与酰肼和肼在酸性催化剂中的缩合反应。提出了反应机理。所有制备的化合物均通过FTIR,1 H NMR,13 C NMR,质谱和元素分析鉴定。
Synthesis of 2-Amino-4-(2-hydroxynaphthyl)-4H-chromene-3-carbonitriles by Michael Addition and Their Transformation into New Pentacyclic Compounds
作者:Lamia Dammak、Myriam Kammoun、Houcine Ammar、Souhir Abid、Rachid El Gharbi
DOI:10.1080/00397911.2014.924142
日期:2014.10.2
)-4H-chromene-3-carbonitriles were synthesized by Michael addition of various 3-cyanoiminocoumarins and β-naphthol in good yield. The heterocyclization of these materials in an acidic medium leads new heterocyclic compounds, which have not previously been described, in moderate to good yields and good selectivity. The synthesized compounds were characterized by infrared, 1H NMR, 13C NMR, two-dimensional
Synthesis of New Benzopyrano[2,3-c]pyrazoles and 3-triazolonyliminocoumarins From 3-cyano Iminocoumarin Derivatives
作者:S. Trichili、M. Kammoun、S. Abid、H. Ammar
DOI:10.1080/00397911.2014.903422
日期:2014.10.2
Abstract Synthesis of benzopyrano[2,3-c]pyrazoles and 3-triazolonyliminocoumarins was successfully performed using heterocyclization of 3-cyano iminocoumarin or their N-ethoxycarbonylated derivatives with semicarbazide reagents. Elemental analysis, infrared, and 1H NMR spectral data confirmed the molecular structure of the newly synthesized compounds. GRAPHICAL ABSTRACT
Enantioselective synthesis of 2-amino-4-(nitromethyl)-4<i>H</i>-chromene-3-carbonitriles from 2-iminochromenes
作者:Gamze Koz、Omer Koz、Necdet Coskun
DOI:10.1080/00397911.2016.1177728
日期:2016.5.18
ABSTRACT A series of medicinally important 2-amino-4-(nitromethyl)-4H-chromene-3-carbonitriles were synthesized using enantioselective conjugateaddition of nitromethane to 2-iminochromenes. The reactions were performed using L8-Cu (II) catalytic system and moderate to good enantioselectivities (62–88%) and yields (66–96%) were obtained. GRAPHICAL ABSTRACT
摘要 利用硝基甲烷与 2-亚氨基色烯的对映选择性共轭加成,合成了一系列具有药用价值的 2-氨基-4-(硝基甲基)-4H-色烯-3-腈。使用 L8-Cu (II) 催化体系进行反应,获得了中等至良好的对映选择性 (62-88%) 和产率 (66-96%)。图形概要