- Design and Synthesis of Orally Bioavailable Piperazine Substituted 4(1H)-Quinolones with Potent Antimalarial Activity: Structure-Activity and Structure-Property Relationship Studies
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Malaria deaths have been decreasing over the last 10-15 years, with global mortality rates having fallen by 47% since 2000. While the World Health Organization (WHO) recommends the use of artemisinin-based combination therapies (ACTs) to combat malaria, the emergence of artemisinin resistant strains underscores the need to develop new antimalarial drugs. Recent in vivo efficacy improvements of the historical antimalarial ICI 56,780 have been reported, however, with the poor solubility and rapid development of resistance, this compound requires further optimization. A series of piperazine-containing 4(1H)-quinolones with greatly enhanced solubility were developed utilizing structure-activity relationship (SAR) and structure-property relationship (SPR) studies. Furthermore, promising compounds were chosen for an in vivo scouting assay to narrow selection for testing in an in vivo Thompson test. Finally, two piperazine-containing 4(1H)-quinolones were curative in the conventional Thompson test and also displayed in vivo activity against the liver stages of the parasite.
- Neelarapu, Raghupathi,Maignan, Jordany R.,Lichorowic, Cynthia L.,Monastyrskyi, Andrii,Mutka, Tina S.,LaCrue, Alexis N.,Blake, Lynn D.,Casandra, Debora,Mashkouri, Sherwin,Burrows, Jeremy N.,Willis, Paul A.,Kyle, Dennis E.,Manetsch, Roman
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p. 1450 - 1473
(2018/03/05)
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- Structure-activity relationship study of pyrimido[1,2-c][1,3]benzothiazin- 6-imine derivatives for potent anti-HIV agents
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3,4-Dihydro-2H,6H-pyrimido[1,2-c][1,3]benzothiazin-6-imine (PD 404182) is an antiretroviral agent with submicromolar inhibitory activity against human immunodeficiency virus-1 (HIV-1) and HIV-2 infection. In the current study, the structure-activity relationships of accessory groups at the 3- and 9-positions of pyrimido[1,2-c][1,3]benzothiazin-6-imine were investigated for the development of more potent anti-HIV agents. Several different derivatives containing a 9-aryl group were designed and synthesized using Suzuki-Miyaura cross-coupling and Ullmann coupling reactions. Modification of the m-methoxyphenyl or benzo[d][1,3]dioxol-5-yl group resulted in improved anti-HIV activity. In addition, the 2,4-diazaspiro[5.5]undec-2-ene-fused benzo[e][1,3]thiazine derivatives were designed and tested for their anti-HIV activities. The most potent 9-(benzo[d][1,3]dioxol-5-yl) derivative was two-threefold more effective against several strains of HIV-1 and HIV-2 than the parent compound, PD 404182.
- Mizuhara, Tsukasa,Oishi, Shinya,Ohno, Hiroaki,Fujii, Nobutaka,Shimura, Kazuya,Matsuoka, Masao
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p. 6434 - 6441,8
(2012/12/12)
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- ALKYNYL CONTAINING HYDROXAMIC ACID DERIVATIVES, THEIR PREPARATION AND THEIR USE AS MATRIX METALLOPROTEINASE (MMP) INHIBITORS / TNF-ALPHA CONVERTING ENZYME (TACE) INHIBITORS
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Compounds of the formula:useful in the treatment of arthritis, tumor metastasis, tissue ulceration, abnormal wound healing, periodontal disease, bone disease, diabetes (insulin resistance) and HIV infection.
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Page/Page column 28
(2010/02/14)
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- N-HYDROXY-2-(ALKYL, ARYL, OR HETEROARYL SULFANYL, SULFINYL OR SULFONYL)-3-SUBSTITUTED ALKYL, ARYL OR HETEROARYLAMIDES AS MATRIX METALLOPROTEINASE INHIBITORS
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Matrix metalloproteinases (MMPs) are a group of enzymes that have been implicated in the pathological destruction of connective tissue and basement membranes. These zinc containing endopeptidases consist of several subsets of enzymes including collagenases, stromelysins and gelatinases. TNF- alpha converting enzymes (TACE), a pro-inflammatory cytokine, catalyze the formation of TNF- alpha from membrane-bound TNF- alpha precursor protein. It is expected that small molecule inhibitors of MMPs and TACE therefore have the potential for treating a variety of disease states. The present invention provides low molecular weight, non-peptide inhibitors of matrix metalloproteinases (MMPs) and TNF- alpha converting enzyme (TACE) for the treatment of arthritis, tumor metastasis, tissue ulceration, abnormal wound healing, periodontal disease, bone disease, diabetes (insulin resistance) and HIV infection. The compounds of this invention are represented by formula (I), where R, R, R and R are described herein.
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- N-hydroxy-2-(Alkyl,Aryl or Heteroaryl sulfanyl, sulfinyl or sulfonyl) 3-substituted alkyl, aryl or heteroarylamides as matrix metalloproteinase inhibitors
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Matrix metalloproteinases (MMps) are a group of enzymes that have been implicated in the pathological destruction of connective tissue and basement membranes. These zinc containing endopeptidases consist of several subsets of enzymes including collagenases, stromelysins and gelatinases. TNF-α converting enzyme (TACE), a pro-inflammatory cytokine, catalyzes the formation of TNF-α from membrane bound TNF-α precursor protein. It is expected that small molecule inhibitors of MMPs and TACE therefore have the potential for treating a variety of disease states. The present invention provides low molecular weight, non-peptide inhibitors of matrix metalloproteinases (MMPs) and TNF-α converting enzyme (TACE) for the treatment of arthritis, tumor metastasis, tissue ulceration, abnormal wound healing, periodontal disease, bone disease, diabetes (insulin resistance) and HIV infection. The compounds of this invention are represented by the formula where R1, R2, R3and R4are described herein.
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Page column 69
(2010/02/04)
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