Results 121 to 130 of about 950 (182)

Four substituted pyrazolines

Acta Crystallographica Section C Crystal Structure Communications, 2007
In the title compounds 5-(3-fluoro-4-phenoxyphenyl)-1,3-biphenyl-4,5-dihydro-1H-pyrazole, C27H21FN2O, (I), 3-(4-chlorophenyl)-5-(3-fluoro-4-phenoxyphenyl)-1-phenyl-4,5-dihydro-1H-pyrazole, C27H20ClFN2O, (II), 5-(3-fluoro-4-phenoxyphenyl)-3-(4-methylphenyl)-1-phenyl-4,5-dihydro-1H-pyrazole, C28H23FN2O, (III), and 5-(3-fluoro-4-phenoxyphenyl)-3-(4 ...
Chopra, Deepak, Mohan, TP, Vishalakshi, B, Row, Guru TN   +3 more
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Pyrazolines: A Biological Review

Mini-Reviews in Medicinal Chemistry, 2013
Pyrazoline is an important five membered nitrogen heterocycle, which has been extensively researched upon. The ring is quite stable and has inspired chemists to carry out various structural variations in the ring. This has propelled the development of distinct pyrazolines with an array of pharmacological activities viz.
Akranth, Marella, Md Rahmat, Ali, Md Tauquir, Alam, Rikta, Saha, Omprakash, Tanwar, Mymoona, Akhter, Md, Shaquiquzzaman, M Mumtaz, Alam   +7 more
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Facile synthesis of spirooxindole-pyrazolines and spirobenzofuranone-pyrazolines and their fungicidal activity

Organic & Biomolecular Chemistry, 2015
A new and facile synthetic method is developed for biologically important spirooxindole-pyrazolines and spirobenzofuranone-pyrazolines.
Changjiang, Yang, Juanjuan, Li, Rong, Zhou, Xiangyu, Chen, Yunpeng, Gao, Zhengjie, He   +5 more
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Preparation of the simplest ?1-pyrazolines by isomerization of ?2-pyrazolines

Chemistry of Heterocyclic Compounds, 1971
Δ2-Pyrazolines that do not have substituants in the 1- and 3-positions are not capable of isomerization to 3-substituted pyrazolines and can be converted to Δ1-pyrazolines by slow distillation in the presence of bases. This method, which is completely analogous to the synthesis of azo compounds from alkylhydrazones, gives good results when applied to 4-
B. V. Ioffe, N. B. Burmanova
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Steroidal pyrazolines

Journal of Heterocyclic Chemistry, 1978
AbstractReaction of 21‐benzal‐5‐pregnen‐3β‐ol‐20‐one acetate with phenylhydrazine or p‐methoxy‐phenylhydrazine in the presence of hydrochloric acid yielded 3β‐aeetoxy‐1′,5′ ‐diphenyl‐5‐preg‐neno[20,21‐c]pyrazoline. Alkaline hydrolysis of the 3β‐acetoxy group followed by Oppenauer oxidation furnished the 3‐oxo‐1′,5′‐diphenyl‐4‐pregneno[20, 21‐c ...
Panayotis Catsoulacos, C. I. Stassinopoulou   +1 more
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TBD-organocatalysed synthesis of pyrazolines

Organic & Biomolecular Chemistry, 2009
It was found that TBD, a cheap and commercially available guanidine, easily catalysed the synthesis of biologically important 3,5-diarylpyrazolines from chalcones and acylhydrazines via a selective secondary amine alkylation.
Mahé, Olivier, Frath, Denis, Dez, Isabelle, Marsais, Francis, Levacher, Vincent, Brière, Jean-François   +5 more
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On the stereochemistry of pyrazolines: 1-Acetyl-3,5-disubstituted pyrazolines-2

Journal of Organometallic Chemistry, 1984
Abstract The geometries of the molecules of the isomeric N -acetyl derivatives of 3-ferrocenyl-5- p -bromophenyl- and 3- p -bromophenyl-5-ferrocenylpyrazolines-2 with a chiral centre in position 5 of pyrazoline have been determined by an X-ray study.
V.G. Andrianov, Yu.T. Struchkov, V.N. Postnov, E.I. Klimova, V.A. Sazonova   +4 more
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Pyrazolines. VII. Concerning the formation of olefins from the pyrolysis of pyrazolines

Canadian Journal of Chemistry, 1967
The geometrically isomeric cis- and trans-5-3-methyl-4-ethyl-3-carbomethoxy-Δ1-pyrazolines were prepared and their pyrolysis and photolysis studied. The isomeric pyrazolines gave cyclopropane products of mixed stereochemistry, but predominantly with retention of the stereochemistry present in the starting pyrazoline.
Donald E. McGreer, Weh-Sai Wu
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A Pyrazoline Derivative of Eunicin Acetate

Acta Crystallographica Section C Crystal Structure Communications, 1996
The present crystal structure determination established spiro [¿3a,4,5,6,7,8,11,12,13,14,15,15a-dodecahydro-6,10,14-trimet hyl-2-oxo-5, 15-epoxy-3H-cyclotetradeca-[b]furan¿-3,3'-1'-pyrazoline]-6-yl acetate, C23H34N2O5, as a pyrazoline derivative of eunicin acetate.
S, Khalil, M B, Hossain, D, van der Helm, M, Alam, R, Sanduja   +4 more
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Insignificant antitubercular activity of pyrazoline, phenyl pyrazoline and isoxazoline moiety in lupeol

Journal of Pharmaceutical Negative Results, 2015
Aim: The Present study is to investigate the antimycobacterial activity of pyrazoline, phenyl pyrazoline and isooxazoline moiety containing lupeol. The main purpose to show insignificant antimicrobial activity of these lupeol derivatives and hence that further researchers do not waste time to investigate antitubercular activity of these group ...
Vandana Khattar, Ankita Wal, AK Rai
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