27293-96-5Relevant academic research and scientific papers
Br?nsted acid-mediated annulations of 1-cyanocyclopropane-1-carboxylates with arylhydrazines: Efficient strategy for the synthesis of 1,3,5-trisubstituted pyrazoles
Xue, Shuwen,Liu, Jiaming,Qing, Xushun,Wang, Cunde
, p. 67724 - 67728 (2016/08/02)
1-Cyanocyclopropane-1-carboxylates are reacted with arylhydrazines to afford 1,3,5-trisubstituted pyrazoles under the influence of a Br?nsted acid. Formally, this transformation can be regarded as an annulation of three-membered rings with α-carbonyl and
Aromatization of 1,3,5-trisubstituted of 4,5-dihydro-1H-pyrazoles by in-situ generation of I+ from hydrogen Peroxide/Acids/iodide potassium or sodium systems
Maleki, Behrooz,Veisi, Hojat
experimental part, p. 4366 - 4370 (2012/02/16)
A simple, green and cost-effective protocol was used for the aromatization of 1,3,5-trisubstituted-2-pyrazolines to the corresponding pyrazoles by in situ generation of iodine (I+) from H2O2/AcOH or SSA or oxalic acid /KI
Regioselective synthesis of multisubstituted pyrazoles via cyclocondensation of β-thioalkyl-α,β-unsaturated ketones with hydrazines
Jin, Weiwei,Yu, Haifeng,Yu, Zhengkun
experimental part, p. 5884 - 5887 (2011/12/02)
Multisubstituted pyrazoles were efficiently synthesized by cyclocondensation of β-thioalkyl-α,β-unsaturated ketones with hydrazines under relatively mild conditions. A one-pot synthetic protocol through tandem Liebeskind-Srogl cross-coupling/cyclocondensation using a-oxo ketene dithioacetals as the starting materials was also realized for the same purpose.
Iodine-mediated synthesis of 2-arylbenzoxazoles, 2-arylbenzimidazoles, and 1,3,5-trisubstituted pyrazoles
Ponnala, Shashikanth,Prasad Sahu, Devi
, p. 2189 - 2194 (2007/10/03)
2-Arylbenzoxazoles and 2-arylbenzimidazoles were synthesized by the reaction of aldehydes with 2-aminophenol and O-phenylenediamines in the presence of iodine. 1,3,5-Trisubstituted pyrazoles were synthesized from chalcones and hydrazines in the presence o
Zr(NO3)4: A versatile oxidizing agent for aromatization of hantzsch 1,4-dihydropyridines and 1,3,5-trisubstituted pyrazolines
Sabitha, Gowravaram,Kumar Reddy, G. S. Kiran,Reddy, Ch. Srinivas,Fatima, Narjis,Yadav
, p. 1267 - 1271 (2007/10/03)
An efficient oxidative aromatization of Hantzsch 1,4-dihydropyridines and 1,3,5-trisubstituted pyrazolines to the corresponding pyridines and pyrazoles has been reported using Zr(NO3)4 in acetic acid at ambient temperature. The react
