A room temperature one-pot Knoevenagel-Chan-Evans-Lam coupling reaction for synthesis of N-aryl-2-Iminocoumarins in bio-mass-derived green solvent 2-methylTHF
作者:Prashant S. Mandal、A. Vijay Kumar
DOI:10.1016/j.tetlet.2019.07.031
日期:2019.9
An efficient approach for the synthesis of biologically interesting N-aryl-2-iminocoumarins by a copper-catalyzed one-pot procedure has been developed by the reaction of 2-hydroxybenzaldehydes, malononitrile and arylboronic acids using triethylamine as a base in a bio-mass-derived greensolvent 2-MethylTHF at room temperature. This protocol allows access to several N-aryl-2-iminocoumarins in high yields
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.
Organocatalytic conjugate addition promoted by multi-hydrogen-bond cooperation: access to chiral 2-amino-3-nitrile-chromenes
作者:Wenjun Li、Jiayao Huang、Jian Wang
DOI:10.1039/c2ob27102h
日期:——
A new efficient enantioselective conjugate addition strategy has been disclosed to rapidly construct 2-amino-3-nitrile-chromene complexes via a multi-hydrogen-bond cooperative activation model.
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。
One-Pot Synthesis of 3-Carboxycoumarins via Consecutive Knoevenagel and Pinner Reactions in Water
Chloro-, hydroxy-, methoxy-, and tert-butyl-substituted 3-carboxycoumarins have been prepared by one-pot procedure by reaction of suitably substituted salicylaldehydes with malononitrile in water. The over-all yields are high and the protocol does not require organic solvents.