894-88-2Relevant academic research and scientific papers
DMSO as a Methine Source in TFA-Mediated One-Pot Tandem Regioselective Synthesis of 3-Substituted-1-Aryl-1 H-Pyrazolo-[3,4- b]quinolines from Anilines and Pyrazolones
Yadav, Pushpendra,Awasthi, Annapurna,Gokulnath, Sabapathi,Tiwari, Dharmendra Kumar
, p. 2658 - 2666 (2021/02/01)
An acid-mediated and DMSO participant one-pot tandem synthesis of 3-substituted-1-aryl-1H-pyrazolo-[3,4- b]quinoline from readily available anilines and pyrazolones was achieved. This method enables regioselective construction of the valuable heterocycles under transition-metal and oxidant-free conditions in which DMSO acts as a methine source as well as solvent making this process an environmentally benign approach. A broad range of diversely substituted aryl amines and pyrazolines are successfully employed in this reaction to access a series of pyrazolo[4,3-c]quinolones through a novel cascade mechanism. Furthermore, the application and mechanistic studies of the present methodology also demonstrated.
Facile and Regioselective Synthesis of Substituted 1H-Pyrazolo[3,4-b]quinolines from 2-Fluorobenzaldehydes and 1H-Pyrazol-5-amines
Szlachcic, Pawe?,Kucharek, Mateusz,Jarosz, Bo?ena,Danel, Andrzej,Stadnicka, Katarzyna
, p. 1729 - 1745 (2017/05/29)
The present article concerns the scope and limitations of the regioselective condensation of 2-fluorobenzaldehydes with 1H-pyrazol-5-amines, leading to the synthesis of substituted 1H-pyrazolo[3,4-b]quinolines (PQ), in the presence of a base catalyst (DAB
Synthesis, electrochemical, photophysical, and electroluminescent properties of organic dyes containing pyrazolo[3, 4-b]quinoline chromophore
Wan, Wen,Wang, Huibin,Lin, Hong,Wang, Jing,Jiang, Yuansong,Jiang, Haizhen,Zhu, Shizheng,Wang, Zixing,Hao, Jian
, p. 138 - 146 (2015/06/08)
Abstract Organic dyes containing trifluoromethylated-pyrazolo[3, 4-b]quinoline were synthesized by using condensation reaction between substituted pyrazolo-4-formaldehyde and aryl amines in moderate yields. Quantum calculation, electrochemical, photophysi
Microwave assisted friedlander condensation catalyzed by clay
Sabitha, Gowravaram,Satheesh Babu,Subba Reddy,Yadav
, p. 4403 - 4408 (2007/10/03)
Clay catalyzed Friedlander condensation of 2-amino arylaldehyde or ketone with carbonyl compounds containing α-methylene group has been achieved in solvent free condition under microwave irradiation to give polycyclic quinoline derivatives.
Attempted Niementowski condensation of anthranilic acid and its ester with 3-Methyl-1-phenylpyrazolin-5-one
Danel,Tomasik,Kappe,Gheath
, p. 302 - 309 (2007/10/03)
Two groups of compounds were formed in the attempted reaction of anthranilic acid and its ester with 3-methyl-1-phenylpyrazolin -5-one. The reactions of 3-methyl-1-phenylpyrazolin-5-one with aniline generated by decarboxylation of anthranilic acid constituted the first group of products. The second group of products comprised of pyrazole derivatives formed mainly by dimerization and dehydration of two molecules of 3-methyl-1-phenylpyrazolin-5-one.
Condensation of 2-Nitrobenzaldehyde with Pyrazolin-5-ones. Structure of 4-(2'-Nitrobenzylidene)pyrazolin-5-ones and their Reductive Cyclization
Danel, A.,Tomasik, P.
, p. 1013 - 1017 (2007/10/02)
The condensation of 1-H-3-methyl-, 3-methyl-1-phenyl-, 1,3-diphenyl- and 1-methyl-3-phenyl-pyrazolin-5-ones with 2-nitrobenzaldehyde resulted in forming the corresponding 4-(2'-nitrobenzylidene)pyrazolin-5-ones.In some cases these products were assisted b
QUANTUM CHEMICAL CI-1 ANALYSIS OF UV ABSORPTION SPECTRA OF 1H-PYRAZOLOQUINOLINE SYSTEM
Pietrzycki, Wladyslaw,Danel, Andrzej,Tomasik, Piotr
, p. 725 - 742 (2007/10/02)
Simulations of UV-absorption spectra in the region of 200 to 360 nm of 1-methyl-3-phenyl, 1-phenyl-3-methyl- and 1,3-diphenyl-pyrazolo quinolines were carried out.The simulations involved CNDO/S-CI-1 calculations of energies, oscillator strengths a
