Practical synthesis of 1,3-diaryl-5-alkylpyrazoles by a highly regioselective N-arylation of 3,5-disubstituted pyrazoles with 4-fluoronitrobenzene
作者:Xiao-jun Wang、Jonathan Tan、Karl Grozinger、Raj Betageri、Tom Kirrane、John R Proudfoot
DOI:10.1016/s0040-4039(00)00849-2
日期:2000.7
3-Aryl-5-alkylpyrazoles undergo a highlyregioselective arylation on N-1 atom with 4-fluoronitrobenzene in the presence of base to yield the corresponding 1-(4-nitrophenyl)pyrazoles.
[EN] SUBSTITUTED 1-(4-AMINOPHENYL)PYRAZOLES AND THEIR USE AS ANTI-INFLAMMATORY AGENTS<br/>[FR] 1-(4-AMINOPHENYL) PYRAZOLES SUBSTITUES ET LEUR UTILISATION EN TANT QU'AGENTS ANTI-INFLAMMATOIRES
申请人:BOEHRINGER INGELHEIM PHARMACEUTICALS, INC.
公开号:WO1999062885A1
公开(公告)日:1999-12-09
(EN) 1-(4-aminophenyl)pyrazoles optionally substituted on the 3- and 5-positions of the pyrazole ring and on the amino group at the 4-position of the phenyl ring are disclosed and described, which pyrazoles inhibit IL-2 production in T-lymphocytes.(FR) L'invention concerne des 1-(4-aminophényl) pyrazoles éventuellement substitués dans les positions 3- et 5- du cycle pyrazole et dans le groupe aminé en position 4- du cycle phényle, ces pyrazoles inhibant la production de Il-2 par les lymphocytes T.
Divergent Synthesis of 1<i>H</i>-Indazoles and 1<i>H</i>-Pyrazoles from Hydrazones<i>via</i>Iodine-Mediated Intramolecular Aryl and<i>sp</i><sup>3</sup>C-H Amination
by condensation of hydrazines with the corresponding ketones. In the presence of potassium iodide, I2-mediated oxidative cyclization of diaryl and tert-butyl aryl ketone hydrazones produced 1H-indazoles via direct aryl C–H amination. Under similar reaction conditions, primary and secondary alkyl ketone hydrazones were transformed into 1H-pyrazole products in a reaction involving sp3 C–H amination. This
Substituted 1-(4-aminophenyl)pyrazoles and their use as anti-inflammatory agents
申请人:Boehringer Ingelheim Pharmaceuticals, Inc.
公开号:US06506747B1
公开(公告)日:2003-01-14
1-(4-aminophenyl)pyrazoles optionally substituted on the 3- and 5-positions of the pyrazole ring and on the amino group at the 4-position of the phenyl ring are disclosed and described, which pyrazoles inhibit IL-2 production in T-lymphocytes.