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。