81902-09-2Relevant academic research and scientific papers
One-pot synthesis of 1,3,5-triarylpyrazoles
Huang, Shufang,Ying, Huazhou,Hu, Yongzhou
, p. 478 - 483 (2013/06/27)
A series of novel 1,3,5-triarylpyrazoles were synthesized from flavanones, arylhydrazines, and trimethyl phosphate in an one-pot procedure. Facile reaction process, easy after-reaction workshop, and good yields are the distinct characteristics of the developed protocol. The target compounds were characterized by element analysis, infrared ray (IR), 1H NMR spectra, and electrospray ionization-mass spectrometry. The structure of representative compound (C23H20N2O3, Mr = 372.42) was further confirmed by X-ray diffraction. It crystallizes in monoclinic, space group P 21/c, a = 8.9720(5), b = 24.5523(13), c = 8.9687(6) A, α = 90.0000, β = 102.6417(17), γ = 90.0000°, V = 1927.76(20) A3, Z = 4, μ(MoKα) = 0.086, F(000) = 784, Dc = 1.283 g/cm3, the final R = 0.0349 and wR = 0.0844 for 1668 observed reflections (I > 2σ(I)).
Synthesis of pyrazole and isoxazole in triethanolamine medium
Agrawal, Nitin N.,Soni
, p. 532 - 534 (2008/09/18)
Reactions of 2′-hydroxy chalcone dibromides 2a-1 with phenyl hydrazine and hydrazine hydrate afford pyrazoles 1a-1 and with hydroxylamine hydrochloride give isoxazoles 5a-f in triethanolamine medium. Similarly reaction of β-diketone 3b-e with phenyl hydra
Reaction of 3-Iodoflavanones with Hydrazine Hydrate & Phenylhydrazine: Synthesis of Pyrazoles
Joshi, M. G.,Wadokar, K. N.
, p. 1089 - 1090 (2007/10/02)
3-Iodoflavanones (IIa-d), obtained from 2'-hydroxy-4-methoxychalkones and ICl in acetic acid, when reacted with N2H4 * H2O in ethanol at room temperature give 3,5-diarylpyrazoles (IIIa-d) while with C6H5NH-NH2 * HCl in pyridine, 3,5-diaryl-1-phenylpyrazoles (IVa-d) are obtained.The identity of III and IV has been confirmed by independent and unambiguous synthesis of these pyrazoles from 2-hydroxydibenzoylmethanes.
