Cross-coupling of 1-aryl-5-bromopyrazoles: regioselective synthesis of 3,5-disubstituted 1-arylpyrazoles
摘要:
The cross-coupling of 1-aryl-5-bromopyrazoles 4 with alkynes, vinyltins and arylboronic acids promoted by Pd(PPh3)(4) afforded unsymmetrical 3,5-disubstituted 1-arylpyrazoles 5-8 in excellent yields. 1-Aryl-5-bromopyrazoles 4 were prepared from their corresponding 1-arylpyrazolones 3 with PBr3 in refluxing acetonitrile. (C) 2000 Elsevier Science Ltd. All rights reserved.
Michaelis; Behn, Chemische Berichte, 1900, vol. 33, p. 2599
作者:Michaelis、Behn
DOI:——
日期:——
US6506747B1
申请人:——
公开号:US6506747B1
公开(公告)日:2003-01-14
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.
Cross-coupling of 1-aryl-5-bromopyrazoles: regioselective synthesis of 3,5-disubstituted 1-arylpyrazoles
作者:Xiao-jun Wang、Jonathan Tan、Karl Grozinger
DOI:10.1016/s0040-4039(00)00704-8
日期:2000.6
The cross-coupling of 1-aryl-5-bromopyrazoles 4 with alkynes, vinyltins and arylboronic acids promoted by Pd(PPh3)(4) afforded unsymmetrical 3,5-disubstituted 1-arylpyrazoles 5-8 in excellent yields. 1-Aryl-5-bromopyrazoles 4 were prepared from their corresponding 1-arylpyrazolones 3 with PBr3 in refluxing acetonitrile. (C) 2000 Elsevier Science Ltd. All rights reserved.