A novel arylation of sulfonamides with boronic acids to afford numerous diaryl sulfones via a visible light-mediated N–S bond cleavage other than the typical transition-metal-catalyzed C(O)–N bond activation is described. This methodology, which represents the first catalyst-free protocol for the sulfonylation of boronic acids, is characterized by its simple reaction conditions, good functional group
Process for the preparation of tetrazole derivatives
申请人:ZENECA LIMITED
公开号:EP0495626A1
公开(公告)日:1992-07-22
A compound of formula VI
wherein Q is selected from (substituted) 4-quinolyloxy, (substituted) 4-pyridyloxy and substituted 1-imidazolyl;
Y¹ is selected from hydrogen, (1-4C)alkyl, (1-4C)alkoxy, halogeno, (1-4C)alkanoyl, trifluoromethyl, cyano and nitro;
Y² is selected from hydrogen, (1-4C)alkyl, (1-4C)alkoxy, halogeno, trifluoromethyl, cyano and nitro; and
P¹ is an electron-deficient phenyl group or a pyridyl or pyrimidyl group,
is reacted with a base selected from an alkali metal hydroxide, (1-12C)alkanolate, (1-12C)alkanethiolate, phenolate, thiophenolate and diphenylphosphide, wherein any phenyl ring of the latter three groups may optionally bear a (1-4C)alkyl, (1-4C)alkoxy or halogeno substituent;
to give a compound of formula IV
wherein Q, Y¹ and Y² have any of the meanings defined above. The compounds of formula IV are angiotensin II inhibitors.
The present invention relates to compounds of formula (I):
and pharmaceutically acceptable salts thereof, wherein R
1
to R
6
, A, B, X, Y and n are as defined herein. The invention also relates to pharmaceutical compositions comprising these compounds, methods of using these compounds in the treatment of various diseases and disorders, processes for preparing these compounds and intermediates useful in these processes.
Heesing, Albert; Kleine Homann, Walter; Muellers, Wolfgang, Chemische Berichte, 1980, vol. 113, # 1, p. 152 - 164
作者:Heesing, Albert、Kleine Homann, Walter、Muellers, Wolfgang
DOI:——
日期:——
Design, synthesis, and biological evaluation of substituted 3-alkylthio-4,5-diaryl-4H-1,2,4-triazoles as selective COX-2 inhibitors
作者:Latifeh Navidpour、Hamed Shafaroodi、Khosrou Abdi、Mohsen Amini、Mohammad H. Ghahremani、Ahmad Reza Dehpour、Abbas Shafiee
DOI:10.1016/j.bmc.2005.11.029
日期:2006.4
A new type of 4,5-diaryl-4H-1,2,4-triazole, possessing C-3 thio and alkylthio (SH, SMe or SEt) substituents was designed and synthesized for evaluation as selective cyclooxygenase-2 (COX-2) inhibitors with in vivo anti-inflarnmatory activity. The compound, 3-etilylthio-5-(4-fluorophenyl)-4-(4-methylsulfonylphenyl)-4H-1,2,4-triazole (10d), exhibited a high in vitro selectivity (COX-1 IC50 = 20.5 nM; COX-2 IC50 = 1.8 nM; SI = 11.39) relative to the reference drug celecoxib (COX-1 IC50 = 3.7 nM; COX-2 IC50 = 2.2 nM; SI = 1.68) and also showed good anti-inflammatory activity compared to celecoxib in a carrageenan-induced rat paw edema assay. (c) 2005 Elsevier Ltd. All rights reserved.