1,2-Diarylimidazoles as Potent, Cyclooxygenase-2 Selective, and Orally Active Antiinflammatory Agents
摘要:
Series of 1,2-diarylimidazoles has been synthesized and found to contain highly potent and selective inhibitors of the human COX-2 enzyme. The paper describes a short synthesis of the target 1,2-diarylimidazoles starting with aryl nitriles. Different portions of the diarylimidazole (I) were modified to establish SAR. Systematic variations of the substituents in the aryl ring B have yielded very potent (IC50 = 10-100 nm) and selective (1000-12500) inhibitors of the COX-2 enzyme. The study on the influence of substituents in the imidazole ring established that a CF3 group at position 4 gives the optimum oral activity. A number of the diarylimidazoles showed excellent inhibition in the adjuvant induced arthritis model (e.g., ED50 = 0.02 mph for 22 and 34). The diarylimidazoles are also potent inhibitors of carrageenan-induced edema (ED50 = 9-30 mph) sind hyperalgesia (ED50 = 11-40 mpk). Several orally active diarylimidazoles show no GI toxicity in the rat and mouse up to 200 mpk.
1,2-Diarylimidazoles as Potent, Cyclooxygenase-2 Selective, and Orally Active Antiinflammatory Agents
摘要:
Series of 1,2-diarylimidazoles has been synthesized and found to contain highly potent and selective inhibitors of the human COX-2 enzyme. The paper describes a short synthesis of the target 1,2-diarylimidazoles starting with aryl nitriles. Different portions of the diarylimidazole (I) were modified to establish SAR. Systematic variations of the substituents in the aryl ring B have yielded very potent (IC50 = 10-100 nm) and selective (1000-12500) inhibitors of the COX-2 enzyme. The study on the influence of substituents in the imidazole ring established that a CF3 group at position 4 gives the optimum oral activity. A number of the diarylimidazoles showed excellent inhibition in the adjuvant induced arthritis model (e.g., ED50 = 0.02 mph for 22 and 34). The diarylimidazoles are also potent inhibitors of carrageenan-induced edema (ED50 = 9-30 mph) sind hyperalgesia (ED50 = 11-40 mpk). Several orally active diarylimidazoles show no GI toxicity in the rat and mouse up to 200 mpk.
A novel approach to the Cu-catalyzed cyanation of simple arenes using acetonitrile as an attractive cyano source has been documented. The C–H functionalization of arenes without directing groups involves a sequential iodination/cyanation to give the desired aromatic nitriles in good yields. A highly efficient Cu/TEMPO system for acetonitrile C–CN bond cleavage has been discovered. TEMPO is used as
Iron(II)‐Catalyzed Direct Cyanation of Arenes with Aryl(cyano)iodonium Triflates
作者:Zhibin Shu、Wenzhi Ji、Xi Wang、Yujing Zhou、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201309791
日期:2014.2.17
A direct oxidative cyanation of arenes under FeII catalysis with 3,5‐di(trifluoromethyl)phenyl(cyano)iodonium triflate (DFCT) as the cyanating agent has been developed. The reaction is applicable to wide range of aromatic substrates, including polycyclic structures and heteroaromatic compounds.
Convenient Conversion of Aldoximes into Nitriles with <i>N</i>-Chlorosuccinimide and Pyridine
作者:W. Gołebiewski、Mirosaw Gucma
DOI:10.1055/s-2008-1067106
日期:——
Benzaldehyde oximes substituted with electron-donating groups are dehydrated to the corresponding benzonitriles by N-chlorosuccinimide/pyridine in acetonitrile. Benzaldehyde oxime itself and alkanal oximes afford the corresponding aldehydes.
Arylthioamides as H<sub>2</sub>S Donors: <scp>l</scp>-Cysteine-Activated Releasing Properties and Vascular Effects in Vitro and in Vivo
作者:Alma Martelli、Lara Testai、Valentina Citi、Alice Marino、Isabella Pugliesi、Elisabetta Barresi、Giulia Nesi、Simona Rapposelli、Sabrina Taliani、Federico Da Settimo、Maria C. Breschi、Vincenzo Calderone
DOI:10.1021/ml400239a
日期:2013.10.10
A small library of arylthioamides 1-12 was easily synthesized, and their H2S-releasing properties were evaluated both in the absence or in the presence of an organic thiol such as L-cysteine. A number of arylthioamides (1-3 and 7) showed a slow and L-cysteine-dependent H2S-releasing mechanism, similar to that exhibited by the reference slow H2S-releasing agents, such as diallyl disulfide (DADS) and the phosphinodithioate derivative GYY 4137. Compound 1 strongly abolished the noradrenaline-induced vasoconstriction in isolated rat aortic rings and hyperpolarized the membranes of human vascular smooth muscle cells in a concentration-dependent fashion. Finally, a significant reduction of the systolic blood pressure of anesthetized normotensive rats was observed after its oral administration. Altogether these results highlighted the potential of arylthioamides 1-3 and 7 as H2S-donors for basic studies, and for the rational design/development of promising pharmacotherapeutic agents to treat cardiovascular diseases.
8-(4-Methoxyphenyl)pyrazolo[1,5-<i>a</i>]-1,3,5-triazines: Selective and Centrally Active Corticotropin-Releasing Factor Receptor-1 (CRF<sub>1</sub>) Antagonists
作者:Paul J. Gilligan、Liqi He、Todd Clarke、Parcharee Tivitmahaisoon、Snjezana Lelas、Yu-Wen Li、Karen Heman、Lawrence Fitzgerald、Keith Miller、Ge Zhang、Anne Marshall、Carol Krause、John McElroy、Kathyrn Ward、Helen Shen、Harvey Wong、Scott Grossman、Gregory Nemeth、Robert Zaczek、Stephen P. Arneric、Paul Hartig、David W. Robertson、George Trainor
DOI:10.1021/jm9000242
日期:2009.5.14
This report describes the syntheses and structure-activity relationships of 8-(4-methoxyphenyl)pyrazolo[1,5-a]-1,3,5-triazine corticotropin releasing factor receptor-1 (CRF1) receptor antagonists. CRF1 receptor antagonists may be potential anxiolytic or antidepressant drugs. This research culminated in the discovery of analogue 12-3. which is a potent, selective CRF1 antagonist (hCRF(1) IC50 = 4.7 +/- 2.0 nM) with weak affinity for the CRF-binding protein and biogenic amine receptors. This compound also has a good pharmacokinetic profile in dogs. Analogue 12-3 is orally effective in two rat models of anxiety: the defensive withdrawal (situational anxiety) model and the elevated plus maze test. Analogue 12-3 has been advanced to clinical trials.