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Marino JP, Kallander LS, Ma C, Oh HJ, Lee D, Gaitanopoulos DE, Krawiec JA, Parks DJ, Webb CL, Ziegler K, Jaye M, Thompson SK. The discovery of tertiary-amine LXR agonists with potent cholesterol efflux activity in macrophages. Bioorg Med Chem Lett 2009; 19:5617-21. [PMID: 19717304 DOI: 10.1016/j.bmcl.2009.08.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2009] [Revised: 08/07/2009] [Accepted: 08/07/2009] [Indexed: 11/28/2022]
Abstract
The liver X receptors (LXR) play a key role in cholesterol homeostasis and lipid metabolism. SAR studies around tertiary-amine lead molecule 2, an LXR full agonist, revealed that steric and conformational changes to the acetic acid and propanolamine groups produce dramatic effects on agonist efficacy and potency. The new analogs possess good functional activity, demonstrating the ability to upregulate LXR target genes, as well as promote cholesterol efflux in macrophages.
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Affiliation(s)
- Joseph P Marino
- Chemistry, Metabolic Pathways Centre for Excellence in Drug Discovery, GlaxoSmithKline, 709 Swedeland Road, King of Prussia, PA 19406, United States.
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2
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Goodman KB, Cui H, Dowdell SE, Gaitanopoulos DE, Ivy RL, Sehon CA, Stavenger RA, Wang GZ, Viet AQ, Xu W, Ye G, Semus SF, Evans C, Fries HE, Jolivette LJ, Kirkpatrick RB, Dul E, Khandekar SS, Yi T, Jung DK, Wright LL, Smith GK, Behm DJ, Bentley R, Doe CP, Hu E, Lee D. Development of dihydropyridone indazole amides as selective Rho-kinase inhibitors. J Med Chem 2007; 50:6-9. [PMID: 17201405 DOI: 10.1021/jm0609014] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Rho kinase (ROCK1) mediates vascular smooth muscle contraction and is a potential target for the treatment of hypertension and related disorders. Indazole amide 3 was identified as a potent and selective ROCK1 inhibitor but possessed poor oral bioavailability. Optimization of this lead resulted in the discovery of a series of dihydropyridones, exemplified by 13, with improved pharmacokinetic parameters relative to the initial lead. Indazole substitution played a critical role in decreasing clearance and improving oral bioavailability.
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Affiliation(s)
- Krista B Goodman
- Department of Medicinal Chemistry, GlaxoSmithKline Pharmaceuticals, King of Prussia, Pennsylvania 19406, USA.
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3
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Stavenger RA, Cui H, Dowdell SE, Franz RG, Gaitanopoulos DE, Goodman KB, Hilfiker MA, Ivy RL, Leber JD, Marino JP, Oh HJ, Viet AQ, Xu W, Ye G, Zhang D, Zhao Y, Jolivette LJ, Head MS, Semus SF, Elkins PA, Kirkpatrick RB, Dul E, Khandekar SS, Yi T, Jung DK, Wright LL, Smith GK, Behm DJ, Doe CP, Bentley R, Chen ZX, Hu E, Lee D. Discovery of Aminofurazan-azabenzimidazoles as Inhibitors of Rho-Kinase with High Kinase Selectivity and Antihypertensive Activity. J Med Chem 2006; 50:2-5. [PMID: 17201404 DOI: 10.1021/jm060873p] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The discovery, proposed binding mode, and optimization of a novel class of Rho-kinase inhibitors are presented. Appropriate substitution on the 6-position of the azabenzimidazole core provided subnanomolar enzyme potency in vitro while dramatically improving selectivity over a panel of other kinases. Pharmacokinetic data was obtained for the most potent and selective examples and one (6n) has been shown to lower blood pressure in a rat model of hypertension.
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Affiliation(s)
- Robert A Stavenger
- Department of Medicinal Chemistry, GlaxoSmithKline, King of Prussia, Pennsylvania 19406, USA.
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4
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Keenan RM, Weinstock J, Finkelstein JA, Franz RG, Gaitanopoulos DE, Girard GR, Hill DT, Morgan TM, Samanen JM, Peishoff CE. Potent nonpeptide angiotensin II receptor antagonists. 2. 1-(Carboxybenzyl)imidazole-5-acrylic acids. J Med Chem 1993; 36:1880-92. [PMID: 8515425 DOI: 10.1021/jm00065a011] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The further evolution of the imidazole-5-acrylic acid series of nonpeptide angiotensin II receptor antagonists is detailed (for Part 1, see: J. Med. Chem. 1992, 35, 3858). Modifications of the N-benzyl ring substitution were undertaken in an effort to mimic the Tyr4 residue of angiotensin II. Introduction of a p-carboxylic acid on the N-benzyl ring resulted in the discovery of compounds with nanomolar affinity for the receptor and good oral activity. SAR studies of these potent antagonists revealed that the thienyl ring, the (E)-acrylic acid, and the imidazole ring in addition to the two acid groups were important for high potency. Also, overlay comparisons of the parent diacid with both angiotensin II and a representative biphenylyltetrazole nonpeptide angiotensin II receptor antagonist are presented. The parent diacid analog, SK&F 108566 or (E)-3-[2-butyl-1-(4-carboxybenzyl)-1H-imidazole-5-yl]-2-[(2- thienyl)methyl]propenoic acid, is currently in clinical development for the treatment of hypertension.
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Affiliation(s)
- R M Keenan
- Department of Medicinal Chemistry, SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania 19406-0939
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5
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Keenan RM, Weinstock J, Finkelstein JA, Franz RG, Gaitanopoulos DE, Girard GR, Hill DT, Morgan TM, Samanen JM, Hempel J. Imidazole-5-acrylic acids: potent nonpeptide angiotensin II receptor antagonists designed using a novel peptide pharmacophore model. J Med Chem 1992; 35:3858-72. [PMID: 1433195 DOI: 10.1021/jm00099a013] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A series of novel nonpeptide angiotensin II receptor antagonists containing a substituted (E)-acrylic acid has been developed. The overlay of 1, an imidazole-5-acetic acid found in the patent literature, on a novel pharmacophore model of AII suggested that extension of the acid side chain and attachment of a second aryl residue to mimic the C-terminal phenylalanine region of AII would lead to increased activity. A study of extended acid side chains at C-5 of the imidazole nucleus led to the discovery of the (E)-acrylic acid 5 as a promising starting point for further exploration. As predicted by the modeling, substitution of a benzyl group on the acrylic acid side chain to mimic the phenylalanine gave increased potency. An extensive study of the SAR of the newly introduced aromatic ring revealed that electron-rich heteroaryl rings provided improved activity, most notably in the in vivo rat models. Compound 40, (E)-3-[2-butyl-1- [(2-chlorophenyl)methyl]imidazol-5-yl]-2-[(2-thienyl)methyl]-2- propenoic acid, has been shown to be a potent, competitive, and orally active small molecule AT-1 receptor antagonist. It exhibits a 2 orders of magnitude increase in binding affinity and a 10-fold improvement in in vivo potency as compared to compound 1 and represents an important milestone in the development of even more potent nonpeptide angiotensin II receptor antagonists.
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Affiliation(s)
- R M Keenan
- Department of Medicinal Chemistry, SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania 19406-0939
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6
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Weinstock J, Keenan RM, Samanen J, Hempel J, Finkelstein JA, Franz RG, Gaitanopoulos DE, Girard GR, Gleason JG, Hill DT. 1-(carboxybenzyl)imidazole-5-acrylic acids: potent and selective angiotensin II receptor antagonists. J Med Chem 1991; 34:1514-7. [PMID: 2016730 DOI: 10.1021/jm00108a043] [Citation(s) in RCA: 108] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- J Weinstock
- Research and Development Division, SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania 19406-0939
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7
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Brooks DP, DePalma PD, Cyronak MJ, Bryant MA, Karpinski K, Mico B, Gaitanopoulos DE, Chambers PA, Erhard KF, Weinstock J. Identification of fenoldopam prodrugs with prolonged renal vasodilator activity. J Pharmacol Exp Ther 1990; 254:1084-9. [PMID: 1975620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Fenoldopam (SK&F 82526) is a short-acting selective dopamine-1 agonist in clinical trials for the treatment of hypertension, congestive heart failure and renal failure. In the present study, we tested various N-ethyl carbamate esters of fenoldopam in the conscious dog instrumented with a femoral arterial Vascular-Access-Port and a renal artery flow probe. Oral administration of SK&F R-82526 at 1 and 3 mumol/kg resulted in transient (30-60 min) dose-dependent increases in plasma fenoldopam levels and renal blood flow. Administration of the 7,8-bis-N-ethyl carbamate ester of R-fenoldopam (SK&F R-106114) and the 4',7,8-tris-N-ethyl carbamate ester of R-fenoldopam (SK&F R-105058) at 1, 3 and 10 mumol/kg p.o. also resulted in dose-dependent increases in plasma fenoldopam levels and renal blood flow; however, both parameters remained elevated for at least 4 hr. Intravenous administration of SK&F R-105058 also resulted in sustained plasma fenoldopam levels and increases in renal blood flow, indicating that slow absorption was not the cause of the sustained effect. The present study indicates that N-ethyl carbamate esters of fenoldopam are fenoldopam prodrugs which result in sustained increases in renal blood flow and plasma fenoldopam levels.
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Affiliation(s)
- D P Brooks
- Department of Pharmacology, SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania
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8
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O'Boyle KM, Gaitanopoulos DE, Brenner M, Waddington JL. Agonist and antagonist properties of benzazepine and thienopyridine derivatives at the D1 dopamine receptor. Neuropharmacology 1989; 28:401-5. [PMID: 2568596 DOI: 10.1016/0028-3908(89)90036-1] [Citation(s) in RCA: 112] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Nine structurally related 1-phenyl-1H-3-benzazepine derivatives and two thienopyridines were tested for agonist and antagonist properties at the adenylate cyclase-coupled D1 dopamine receptor in homogenates of the striatum of the rat. The benzazepines SK&F 77434 and SK&F 82958, both of which contain a catechol ring, were agonists; the intrinsic activity of SK&F 77434 was similar to that of SK&F 38393, whereas SK&F 82958 was a full agonist. The remaining benzazepines inhibited the stimulation of adenylate cyclase by dopamine. Antagonist potency depended on the nature of the substituent at position 7 of the benzazepine molecule, 7-halogen compounds being the most potent. The Ki values, obtained from analysis of the antagonism of dopamine-stimulated adenylate cyclase, were significantly correlated with the Ki values for displacement of D1 ligands in binding experiments. Furthermore, antagonist activity of the resolved racemic benzazepine SK&F 83566 resided almost exclusively in the R-enantiomer. The thienopyridine derivatives SK&F 89641 and SK&F 89145 were partial agonists with greater efficacies than SK&F 38393.
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Affiliation(s)
- K M O'Boyle
- Department of Clinical Pharmacology, Royal College of Surgeons, Dublin, Ireland
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9
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Weinstock J, Gaitanopoulos DE, Stringer OD, Franz RG, Hieble JP, Kinter LB, Mann WA, Flaim KE, Gessner G. Synthesis and evaluation of non-catechol D-1 and D-2 dopamine receptor agonists: benzimidazol-2-one, benzoxazol-2-one, and the highly potent benzothiazol-2-one 7-ethylamines. J Med Chem 1987; 30:1166-76. [PMID: 2955118 DOI: 10.1021/jm00390a009] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Our interest in identifying D-1 and D-2 dopamine receptor agonists that are not catechols led us to extend previous studies with oxindoles by investigating analogues of dopamine, N,N-dipropyldopamine, m-tyramine, N,N-dipropyl-m-tyramine, and epinine in which the m-hydroxyl is replaced by the NH portion of a thiazol-2-one, oxazol-2-one, or imidazol-2-one group fused to the 2,3-position. These compounds were evaluated for their affinity and agonist activity at D-1 and D-2 receptors by using in vitro assays. Replacement of the m-hydroxy in N,N-dipropyldopamine with the thiazol-2-one group resulted in a dramatic increase in D-2 receptor affinity and activity compared to that of N,N-dipropyldopamine itself or that of the corresponding oxindole, 1. The resulting compound, 7-hydroxy-4-[2-(di-n-propylamino)ethyl]benzothiazol-2(3H)-one (4), is the most potent D-2 receptor agonist reported to date in the field-stimulated rabbit ear artery (ED50 = 0.028 nM). The benzoxazol-2-one (6), benzimidazol-2-one (5), and isatin (51) analogues showed D-2 receptor agonist potency similar to that of 1. The des-7-hydroxyl analogue of 4 (21) also has enhanced D-2 receptor activity compared to that of the corresponding oxindole, 8. 7-Hydroxy-4-(2-aminoethyl)benzothiazol-2(3H)-one, 27, a non-catechol, has enhanced D-1 and D-2 receptor activity in vitro compared to that of the corresponding oxindole, 7. In vivo, 27 increased renal blood flow and decreased blood pressure in the dog. However, these effects were mediated primarily by D-2 receptor agonist activity. This may be a result of the D-1 partial agonist activity of 27 coupled with its potent D-2 receptor activity.
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10
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Weinstock J, Gaitanopoulos DE, Oh HJ, Pfeiffer FR, Karash CB, Venslavsky JW, Sarau HM, Flaim KE, Hieble JP, Kaiser C. Synthesis and dopaminergic activity of some halogenated mono- and dihydroxylated 2-aminotetralins. J Med Chem 1986; 29:1615-27. [PMID: 2875183 DOI: 10.1021/jm00159a010] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In a series of 7,8-dihydroxy-1-phenyltetrahydro-3-benzazepine dopamine receptor agonists introduction of a chloro or fluoro substituent into the 6-position increases dopaminergic potency. Also, in this series replacement of the 7-hydroxyl group with a halogen results in inversion of activity from dopamine receptor agonist to antagonist. The present study was aimed at exploring the possibility that the structure-activity observations in the 3-benzazepine series of dopaminergic agents might be extrapolated to another class of dopamine receptor agonists, the 2-aminotetralins. Thus, a series of chloro- and fluoro-substituted mono- and dihydroxylated 2-aminotetralins was prepared and evaluated for dopaminergic properties in D-1 and D-2 receptor-related tests. Introduction of a chloro substituent into the 8-position of the prototype of this series, i.e. 2-amino-6,7-dihydroxytetralin (ADTN), resulted in a compound with a high degree of selectivity for the D-1 subpopulation of dopamine receptors; it was equally or more potent than ADTN in the D-1 receptor-related tests with greatly decreased effectiveness in the tests involving D-2 receptors. A similar effect was observed with 8-fluoro-ADTN; however, the N-(4-hydroxyphenethyl)-N-propyl derivative 4g of the 8-chloro-substituted ADTN showed marked D-2 binding affinity. Conversely, introduction of a chloro substituent into the 5-position of ADTN markedly decreased D-1 receptor affinity and efficacy. This effect was not seen with the related 5-fluoro derivative, suggesting D-1 receptors are more sensitive to bulk in the 5-position of ADTN than are the D-2 receptors. Replacement of either the 6- or 7-hydroxyl groups of ADTN with a chloro or fluoro substituent, in contrast, did not parallel the response seen in the benzazepine series (i.e., the compounds uniformly demonstrated less receptor affinity and did not have dopamine receptor antagonist activity); however, the decrease in agonist potency was less marked in the case of 2-amino-6-fluoro-7-hydroxytetralins than in the chlorinated monohydroxyaminotetralins. Thus, a parallelism in structure-activity relationships in the benzazepine and aminotetralin series of dopamine receptor agonists was not observed. The differences may reflect altered modes of receptor binding in the two series.
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12
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Abstract
The synthesis and characterization of the two diastereoisomeric forms of 1-amino-2-hydroxycyclopentanecarboxylic acid have been accomplished. A previously reported synthesis produced a racemic mixture of the threonine analog trans-2-hydroxy-1-aminocyclopentanecarboxylic acid (trans with respect to the hydroxy and carboxyl group). The alternate allothreonine analog was produced by conversion of cyclopentene oxide to trans-2-methoxycyclopentanol, followed by oxidation to 2-methoxycyclopentanone and conversion to a hydantoin. Fractional crystallization of the hydantoin sample, followed by hydrolysis, produced cis-2-hydroxy-1-aminocyclopentanecarboxylic acid (cis with respect to the hydroxy and carboxyl group) in high purity. Neither of the isomeric forms significantly inhibited the growth of the bacterial strains examined nor were they effective in inhibiting Jensen sarcoma cells in tissue culture.
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13
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Weinstock J, Gaitanopoulos DE, Sutton BM. Synthesis of fused phenothiazines. 2,3-dihydro-1H-pyrimido[5,6,1-Kl]phenothiazine-1,3-dione and 6H, 16H-[1,5]diazocino[3,2,1-kl:7,6,5-k'l']diphenothiazine-6,16-dione. J Org Chem 1975; 40:1914-7. [PMID: 1133607 DOI: 10.1021/jo00901a009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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