Synthesis of E - and Z -Pyrazolylacrylonitriles and their evaluation as novel antioxidants
作者:Virinder S Parmar、Ajay Kumar、Ashok K Prasad、Sanjay K Singh、Naresh Kumar、Shubhasish Mukherjee、Hanumantharao G Raj、Sanjay Goel、William Errington、Mohindar S Puar
DOI:10.1016/s0968-0896(99)00056-5
日期:1999.7
A facile synthesis of (Z)- and (E)-2-(5-arylpyrazol-3-yl)-3-(pyrrol-2-yl)acrylonitriles and (Z)-2-(1,3-diarylpyrazol-5-yl)-3-(pyrrol-2-yl)acrylonitriles, and isomerisation of (Z)-2-(5-arylpyrazolyl)acrylonitriles to (E)-2-(5-arylpyrazolyl)acrylonitriles under basic conditions have been reported. (Z)-2-(1,3-Diarylpyrazolyl)acrylonitrile did not undergo isomerisation under the similar conditions. New compounds were identified on the basis of their spectral data (H-1-, C-13-, H-1-H-1 COSY, NOESY, NOE, HMQC NMR, IR, UV and EI mass). The structures of one acrylonitrile and five of their precursor 6-arylpyran-2-ones and cyanomethylpyrazoles were confirmed by X-ray crystallographic studies. Effects of pyrazolylacrylonitriles and their precursors on rat liver-microsomal lipid peroxidation were evaluated in vitro with a view to establish structure-activity relationship and to identify a lead compound. (C) 1999 Elsevier Science Ltd. All rights reserved.