Development of novel antibacterial agents against methicillin-resistant Staphylococcus aureus
摘要:
Methicillin-resistant Staphylococcus aureus (MRSA) poses a serious threat to public health because of its resistance to multiple antibiotics most commonly used to treat infection. In this study, we report the unique ability of the cyclooxygenase-2 (COX-2) inhibitor celecoxib to kill Staphylococcus aureus and MRSA with modest potency. We hypothesize that the anti-Staphylococcus activity of celecoxib could be pharmacologically exploited to develop novel anti-MRSA agents with a distinct mechanism. Examination of an in-house, celecoxib-based focused compound library in conjunction with structural modifications led to the identification of compound 46 as the lead agent with high antibacterial potency against a panel of Staphylococcus pathogens and different strains of MRSA. Moreover, this killing effect is bacteria-specific, as human cancer cells are resistant to 46. In addition, a single intraperitoneal administration of compound 46 at 30 mg/kg improved the survival of MRSA-infected C57BL/6 mice. In light of its high potency in eradicating MRSA in vitro and its in vivo activity, compound 46 and its analogues warrant continued preclinical development as a potential therapeutic intervention against MRSA. (C) 2012 Elsevier Ltd. All rights reserved.
over mesoporoussilica. Pd@FSM with a high palladium loading of ca. 11 mg g−1 exhibited superior catalytic activity for Suzuki–Miyaura cross-couplings and a catalyst loading of 0.05 mol% is typically sufficient to achieve excellent reaction yields. Notably, the reaction is typically carried out in water without removing atmospheric oxygen. The catalyst is conveniently recycled and remains highly active
Synthesis of zwitterionic palladium complexes and their application as catalysts in cross-coupling reactions of aryl, heteroaryl and benzyl bromides with organoboron reagents in neat water
作者:V. Ramakrishna、N. Dastagiri Reddy
DOI:10.1039/c7dt01433c
日期:——
found to be highly active for carrying out these reactions between aryl bromides and organoboron reagents. Further, the scope of the catalyst I was also examined by employing (hetero)aryl bromides, hydrophilic aryl bromides, benzylbromides and various organoboron reagents. More than 80 aryl/benzyl bromide-arylboronic acid combinations were screened in neat water/K2CO3 and found that I is a versatile catalyst
N-(3-氯-2-喹喔啉基)-N'-芳基咪唑鎓盐(芳基= 2,6-二异丙基苯基[HL1Cl] Cl,芳基=甲苯基[HL2Cl] Cl)已通过将2,3-二氯喹喔啉与N'-芳基咪唑纯净。这些咪唑鎓盐与Pd(PPh 3)4和Pd 2(dba)3 / PPh 3(dba =二苄基苯丙酮)在50 o C的容易反应,得到两性离子钯(II)络合物[Pd(HL1)(PPh 3) Cl 2 ](I)和[Pd(HL2)(PPh 3)Cl 2 ](II)的收率极高。已测试I和II在纯水/ K中催化Suzuki-Miyaura交叉偶联(SMC)反应的能力2 CO 3,对在芳基溴化物和有机硼试剂之间进行这些反应具有很高的活性。此外,还通过使用(杂)芳基溴化物,亲水性芳基溴化物,苄基溴化物和各种有机硼试剂来检查催化剂I的范围。在纯水/ K 2 CO 3中筛选了80多种芳基/苄基溴-芳基硼酸组合,发现I是一种多用途催化
Synthesis of Chlorinated Biphenyls by Suzuki Cross-Coupling Using Diamine or Diimine-Palladium Complexes
and their reduced diamine counterparts 3b,3d–3g and 3i form complexes 4a–4i, 5b,5d–5g, and 5i with PdCl2 in DMF or methanol. Using 1 mol-% of the isolated complexes 4e and 5f many polychlorinated biphenyls (PCBs) can be prepared in moderate to excellent yields according to the Suzuki crosscoupling protocol with contact to air. Several 4-acetylbiphen
Methicillin-resistant Staphylococcus aureus (MRSA) poses a serious threat to public health because of its resistance to multiple antibiotics most commonly used to treat infection. In this study, we report the unique ability of the cyclooxygenase-2 (COX-2) inhibitor celecoxib to kill Staphylococcus aureus and MRSA with modest potency. We hypothesize that the anti-Staphylococcus activity of celecoxib could be pharmacologically exploited to develop novel anti-MRSA agents with a distinct mechanism. Examination of an in-house, celecoxib-based focused compound library in conjunction with structural modifications led to the identification of compound 46 as the lead agent with high antibacterial potency against a panel of Staphylococcus pathogens and different strains of MRSA. Moreover, this killing effect is bacteria-specific, as human cancer cells are resistant to 46. In addition, a single intraperitoneal administration of compound 46 at 30 mg/kg improved the survival of MRSA-infected C57BL/6 mice. In light of its high potency in eradicating MRSA in vitro and its in vivo activity, compound 46 and its analogues warrant continued preclinical development as a potential therapeutic intervention against MRSA. (C) 2012 Elsevier Ltd. All rights reserved.
A novel electromagnetic mill promoted mechanochemical solid-state Suzuki–Miyaura cross-coupling reaction using ultra-low catalyst loading
作者:Xin Li、Yunxia Liu、Lizhi Zhang、Yunhui Dong、Qing Liu、Daopeng Zhang、Lei Chen、Zengdian Zhao、Hui Liu
DOI:10.1039/d2gc01427k
日期:——
The Nobel-prize-winning Suzuki–Miyauracross-coupling (SMC) is a practical and attractive strategy for the construction of C–C bonds in both academic and industrial settings. However, the development of solid-state SMC reactions remains extremely scarce. Herein, we report an electromagnetic mill (EMM) promoted solid-state SMC reactionusing ultra-low palladium loading (0.05 mol%) without any liquid