- Evaluation of substituted n-phenylpiperazine analogs as D3 vs. D2 dopamine receptor subtype selective ligands
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N-phenylpiperazine analogs can bind selectively to the D3 versus the D2 dopamine receptor subtype despite the fact that these two D2-like dopamine receptor subtypes exhibit substantial amino acid sequence homology. The binding for a number of these receptor subtype selective compounds was found to be consistent with their ability to bind at the D3 dopamine receptor subtype in a bitopic manner. In this study, a series of the 3-thiophenephenyl and 4-thiazolylphenyl fluoride substituted N-phenylpiperazine analogs were evaluated. Compound 6a was found to bind at the human D3 receptor with nanomolar affinity with substantial D3 vs. D2 binding selectivity (approximately 500-fold). Compound 6a was also tested for activity in two in-vivo assays: (1) a hallucinogenic-dependent head twitch response inhibition assay using DBA/2J mice and (2) an L-dopa-dependent abnormal involuntary movement (AIM) inhibition assay using unilateral 6-hydroxydopamine lesioned (hemiparkinsonian) rats. Compound 6a was found to be active in both assays. This compound could lead to a better understanding of how a bitopic D3 dopamine receptor selective ligand might lead to the development of pharmacotherapeutics for the treatment of levodopa-induced dyskinesia (LID) in patients with Parkinson’s disease.
- Lee, Boeun,Taylor, Michelle,Griffin, Suzy A.,McInnis, Tamara,Sumien, Nathalie,Mach, Robert H.,Luedtke, Robert R.
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- Chrysin-piperazine conjugates as antioxidant and anticancer agents
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Synthesis of 7-(4-bromobutoxy)-5-hydroxy-2-phenyl-4H-chromen-4-one intermediate treating chrysin with 1,4-dibromobutane facilitated combination of chrysin with a wide range of piperazine moieties which were equipped via reacting the corresponding amines with bis(2-chloroethyl)amine hydrochloride in diethylene glycol monomethyl ether solvent. Free radical scavenging potential of prepared products was analyzed in vitro adopting DPPH and ABTS bioassay in addition to the evaluation of in vitro anticancer efficacies against cervical cancer cell lines (HeLa and CaSki) and an ovarian cancer cell line SK-OV-3 using SRB assay. Bearable toxicity of 7a-w was examined employing Madin-Darby canine kidney (MDCK) cell line. In addition, cytotoxic nature of the presented compounds was inspected utilizing Human bone marrow derived mesenchymal stem cells (hBM-MSCs). Overall, 7a-w indicated remarkable antioxidant power in scavenging DPPH+ and ABTS++, particularly analogs 7f, 7j, 7k, 7l, 7n, 7q, 7v, 7w have shown promising free radical scavenging activity. Analogs 7j and 7o are identified to be highly active candidates against HeLa and CaSki cell lines, whereas 7h and 7l along with 7j proved to be very sensitive towards ovarian cancer cell line SKOV-3. None of the newly prepared scaffolds showed cytotoxic nature toward hBM-MSCs cells. From the structure-activity point of view, nature and position of the electron withdrawing and electron donating functional groups on the piperazine core may contribute to the anticipated antioxidant and anticancer action. Different spectroscopic techniques (FT-IR, 1H NMR, 13C NMR, Mass) and elemental analysis (CHN) were utilized to confirm the desired structure of final compounds.
- Patel, Rahul V.,Mistry, Bhupendra,Syed, Riyaz,Rathi, Anuj K.,Lee, Yoo-Jung,Sung, Jung-Suk,Shinf, Han-Seung,Keum, Young-Soo
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- 7-benzyl-4-(4-phenylpiperazin-1-yl)-7H-pyrrolo[2,3-d]pyrimidine derivatives and Composition for skin whitening and Pharmaceutical composition for use in preventing or treating disorders of Melanin Hyperpigmentation containing the same as an active ingredient
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The present invention relates to a 7-benzyl-4(4-phenylpiperazin-1-yl)-7H-pyrrolo[2,3-d]pyrimidine derivative, and to a composition for skin whitening, comprising the same as an active ingredient. Since the derivative exhibits the effect of inhibiting the production of melanin even when used in a small amount, it is useful as a pharmaceutical composition for preventing or treating melanin hyperpigmentation diseases, a cosmetic composition for skin whitening, and a health functional food for skin whitening.
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Paragraph 0209; 0216-0217
(2020/11/06)
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- Design, synthesis and antimycobacterial activity of novel imidazo[1,2-a]pyridine-3-carboxamide derivatives
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We report herein the design and synthesis of “novel imidazo [1,2-a]pyridine-3-carboxamides (IPAs)” bearing a variety of different linkers, based on the structure of IMB-1402 discovered in our lab. Results reveal that 2,6-dimethyl-N-[2-(phenylamino)ethyl] IPAs with an electron-donating group on the benzene ring as a potent scaffold. Compounds 26g and 26h have considerable activity (MIC: 0.041–2.64 μM) against drug-sensitive/resistant MTB strains, and they have acceptable safety indices against MTB H37Rv with the SI values of 4395 and 1405, respectively. Moreover, N-[2-(piperazin-1-yl)ethyl] moiety was also identified as a potentially alternative linker (compound 31), opening a new direction for further SAR studies.
- Lv, Kai,Li, Linhu,Wang, Bo,Liu, Mingliang,Wang, Bin,Shen, Weiyi,Guo, Huiyuan,Lu, Yu
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p. 117 - 125
(2017/06/05)
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- Identification of novel GLUT inhibitors
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The compound class of 1H-pyrazolo[3,4-d]pyrimidines was identified using HTS as very potent inhibitors of facilitated glucose transporter 1 (GLUT1). Extensive structure–activity relationship studies (SAR) of each ring system of the molecular framework was established revealing essential structural motives (i.e., ortho-methoxy substituted benzene, piperazine and pyrimidine). The selectivity against GLUT2 was excellent and initial in vitro and in vivo pharmacokinetic (PK) studies are encouraging.
- Siebeneicher, Holger,Bauser, Marcus,Buchmann, Bernd,Heisler, Iring,Müller, Thomas,Neuhaus, Roland,Rehwinkel, Hartmut,Telser, Joachim,Zorn, Ludwig
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p. 1732 - 1737
(2016/07/27)
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- Microwave-assisted amination from fluorobenzenes without catalyst and strong base
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A facile and versatile amination of fluorobenzenes has been developed in good to excellent yields under microwave irradiation in N-methylpyrrolidinone (NMP) without strong base and catalyst. The presence of additional halogen atom(s) enhanced the leaving ability of fluorine and meta fluorine gave higher activation than the ortho. It is remarkable that 1,2,3-trifluorobenzene, 1,2,4-trifluorobenzene and 1,2,4,5-tetrafluorobenzene can produce the regioselective mono-substituted products.
- Meng, Xiangguo,Cai, Zhengyan,Xiao, Sa,Zhou, Weicheng
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- Discovery and Initial SAR of Arylsulfonylpiperazine Inhibitors of 11β-Hydroxysteroid Dehydrogenase Type 1 (11β-HSD1)
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High-throughput screening of a small-molecule compound library resulted in the identification of a series of arylsulfonylpiperazines that are potent and selective inhibitors of human 11β-Hydroxysteroid Dehydrogenase Type 1 (11β-HSD1). Optimization of the initial lead resulted in the discovery of compound (R)-45 (11β-HSD1 IC50 = 3 nM).
- Sun, Daqing,Wang, Zhulun,Di, Yongmei,Jaen, Juan C.,Labelle, Marc,Ma, Ji,Miao, Shichang,Sudom, Athena,Tang, Liang,Tomooka, Craig S.,Tu, Hua,Ursu, Stefania,Walker, Nigel,Yan, Xuelei,Ye, Qiuping,Powers, Jay P.
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scheme or table
p. 3513 - 3516
(2009/04/11)
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- Potent, selective, and orally active adenosine A2A receptor antagonists: Arylpiperazine derivatives of pyrazolo[4,3-e]-1,2,4-triazolo[1,5-c]pyrimidines
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Antagonism of the adenosine A2A receptor offers great promise in the treatment of Parkinson's disease. Employing the known pyrazolo[4,3-e]-1,2,4-triazolo[1,5-c]pyrimidine A2A antagonist SCH 58261 as a starting point, we identified the potent and selective (vs. A1) antagonist 11 h, orally active in the rat haloperidol-induced catalepsy model. We further optimized this lead to the methoxyethoxyethyl ether 12a (SCH 420814), which shows broad selectivity, good pharmacokinetic properties, and excellent in vivo activity.
- Neustadt, Bernard R.,Hao, Jinsong,Lindo, Neil,Greenlee, William J.,Stamford, Andrew W.,Tulshian, Deen,Ongini, Ennio,Hunter, John,Monopoli, Angela,Bertorelli, Rosalia,Foster, Carolyn,Arik, Leyla,Lachowicz, Jean,Ng, Kwokei,Feng, Kung-I
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p. 1376 - 1380
(2008/02/05)
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- Synthesis of potent and selective dopamine D4 antagonists as candidate radioligands
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A series of dopamine D4 antagonists was synthesized and evaluated as potential candidates for development as positron emission tomography (PET) radioligands. All new compounds display high affinity and selectivity for the D4 receptors and compounds 5b, 5d, and 5e were identified as candidates for radioligand development.
- Huang, Yiyun,Kegeles, Lawrence S.,Bae, Sung-A,Hwang, Dah-ren,Roth, Bryan L.,Savage, Jason E.,Laruelle, Marc
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p. 1375 - 1377
(2007/10/03)
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- D4 receptor selectivity piperazine derivatives
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Piperazine derivatives of the formula I in which R1and R2have the meanings given in claim1are dopamine ligands with a selectivity for the D4 receptor and are suitable for the treatment and prophylaxis of states of anxiety, depression, schizophrenia, obsessions, Parkinson's disease, tardive dyskinesia, nausea and disorders of the gastro-intestinal tract.
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- Synthesis of N-arylpiperazines from aryl halides and piperazine under a palladium tri-tert-butylphosphine catalyst
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A Pd/P(t-Bu), catalyst system has revealed very high activity and selectivity for the amination of N-(hetero)aryl halides with unprotected piperazine. A wide variety of N-(hetero)arylpiperazines could be prepared using this catalyst. Turnover numbers up to 6400mol/mol have been obtained.
- Nishiyama, Masakazu,Yamamoto, Toshihide,Koie, Yasuyuki
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p. 617 - 620
(2007/10/03)
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- Antiviral agents
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Antiviral compounds (I): the symbols being as defined in the specification, are efficacious against infections caused by a variety of DNA viruses, RNA viruses and retroviruses. Other specified compounds also exhibit activity. The compounds have a wider spectrum of activity than known antiviral substances.
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- Activity of aromatic substituted phenylpiperazines lacking affinity for dopamine binding sites in a preclinical test of antipsychotic efficacy
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Generally, antipsychotic agents are dopamine receptor blocking agents that also block conditioned avoidance responding (CAR) in the rat. Recently, however, both (o-methoxyphenyl)piperazine (OMPP, 1h) and (m-chlorophenyl)piperazine (MCPP, 1o) have been reported to block conditioned avoidance responding in the rat although neither has dopamine receptor blocking properties. The present paper examines the behavioral and biochemical profile of a number of additional substituted phenylpiperazines. None of the phenylpiperazines tested demonstrated high affinity for either dopamine D-1 or D-2 receptor sites, yet many effective in blocking CAR. The results suggest that the phenylpiperazines may be effective antipsychotic agents without blocking dopamine receptors. Moreover, the active compounds did demonstrate activity in displacing ligand binding to serotonin receptors. Receptor binding profiles were determined for 5-HT-1A and 5-HT-1B binding sites as well as for 5-HT-2 sites. The data from this preclinical test suggest these phenylpiperazines might be effective antipsychotic agents acting via a nondopaminergic mechanism of action.
- Martin,Elgin Jr.,Mathiasen,Davis,Kesslick,Baldy,Shank,DiStefano,Fedde,Scott
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p. 1052 - 1056
(2007/10/02)
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