Photophysical and electrochemical studies of highly fluorescent pyrazole and imidazole containing heterocycles
作者:Hardesh K. Maurya、Ch. Pavan Kumar、M. Chandrasekharam、Atul Gupta
DOI:10.1016/j.dyepig.2016.09.030
日期:2017.1
Highly congested pyrazole and imidazole ring containing heterocycles were studied for their photophysical and electrochemical properties. TDDFT calculations of the molecules were carried out using B3LYP/G(d,p) level theory in DMF medium and the results were in good agreement with the experimental values. The imidazole derivatives showed a red shifted absorption peak (λmax, 455–474 nm) and higher molar
Choline chloride as an efficient catalyst for the synthesis of styryl-pyrazoles
作者:Hardesh K. Maurya、Kripa Shankar Nainawat、Atul Gupta
DOI:10.1080/00397911.2016.1185124
日期:2016.6.17
ABSTRACT An efficient and green methodology for syntheses of various styryl-pyrazoles (3) from the reaction of 2-(5-phenyl-1H-pyrazol-3-yl)acetonitriles (1) with substituted benzaldehydes (2) by the use of biodegradable, nonhazardous, naturally occurring, and inexpensive choline chloride and NaOH under an environmentally benign medium has been described. GRAPHICAL ABSTRACT
Kumar, Ajay; Husain, Mofazzal; Prasad, Ashok K., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2003, vol. 42, # 8, p. 1950 - 1957
作者:Kumar, Ajay、Husain, Mofazzal、Prasad, Ashok K.、Singh, Ishwar、Vats, Archana、Sharma, Nawal K.、Sharma, Sunil K.、Gupta, Rajinder K.、Olsend, Carl E.、Bracke, Marc E.、Gross, Richard A.、Parmar, Virinder S.
DOI:——
日期:——
A carbanion induced synthesis of highly congested pyrazole and imidazole containing heterocycles
作者:Hardesh K. Maurya、Atul Gupta
DOI:10.1016/j.tetlet.2014.01.095
日期:2014.3
An efficient approach to the synthesis of highly congested di, penta and hexacyclic pyrazoles as well as imidazole fragment containing novel heterocyclic molecule has been developed through a carbanion induced transformation of suitably functionalized 2H-pyran-2-ones, benzo[h]chromene and thiochromeno[4,3-b]pyrans. Due to the presence of fluorescence, we report their prime application metal sensor as off/on switching in ferric ions. (C) 2014 Elsevier Ltd. All rights reserved.
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.