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Reaction of benzyne with 1,2,3,4-tetrahydroisoquinolines as an access to 1 H -3-benzazepines. MENDELEEV COMMUNICATIONS 2018. [DOI: 10.1016/j.mencom.2018.01.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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2
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Zhuge R, Wu L, Quan M, Butt N, Yang G, Zhang W. Palladium-Catalyzed Addition of Arylboronic Acids topara- Quinone Methides for Preparation of Diarylacetates. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201601302] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ruijing Zhuge
- School of Chemistry and Chemical Engineering; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 People's Republic of China
| | - Liang Wu
- School of Chemistry and Chemical Engineering; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 People's Republic of China
| | - Mao Quan
- School of Chemistry and Chemical Engineering; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 People's Republic of China
| | - Nicholas Butt
- School of Chemistry and Chemical Engineering; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 People's Republic of China
| | - Guoqiang Yang
- School of Chemistry and Chemical Engineering; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 People's Republic of China
| | - Wanbin Zhang
- School of Chemistry and Chemical Engineering; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 People's Republic of China
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3
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He Q, Xie F, Fu G, Quan M, Shen C, Yang G, Gridnev ID, Zhang W. Palladium-Catalyzed Asymmetric Addition of Arylboronic Acids to Nitrostyrenes. Org Lett 2015; 17:2250-3. [DOI: 10.1021/acs.orglett.5b00863] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Qun He
- School
of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Fang Xie
- School
of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Guanghong Fu
- School
of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Mao Quan
- School
of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Chaoren Shen
- School
of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Guoqiang Yang
- School
of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Ilya D. Gridnev
- Department
of Chemistry, Graduate School of Science, Tohoku University, Aramaki
3-6, Aoba-ku, Sendai 9808578, Japan
| | - Wanbin Zhang
- School
of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
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4
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Pan P, Knudson S, Bommineni GR, Li HJ, Lai CT, Liu N, Garcia-Diaz M, Simmerling C, Patil SS, Slayden RA, Tonge PJ. Time-dependent diaryl ether inhibitors of InhA: structure-activity relationship studies of enzyme inhibition, antibacterial activity, and in vivo efficacy. ChemMedChem 2014; 9:776-91. [PMID: 24616444 PMCID: PMC4126670 DOI: 10.1002/cmdc.201300429] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Indexed: 11/07/2022]
Abstract
The diaryl ethers are a novel class of antituberculosis drug candidates that inhibit InhA, the enoyl-ACP reductase involved in the fatty acid biosynthesis (FASII) pathway, and have antibacterial activity against both drug-sensitive and drug-resistant strains of Mycobacterium tuberculosis. In the present work, we demonstrate that two time-dependent B-ring modified diaryl ether InhA inhibitors have antibacterial activity in a mouse model of TB infection when delivered by intraperitoneal injection. We propose that the efficacy of these compounds is related to their residence time on the enzyme, and to identify structural features that modulate drug-target residence time in this system, we have explored the inhibition of InhA by a series of B-ring modified analogues. Seven ortho-substituted compounds were found to be time-dependent inhibitors of InhA, where the slow step leading to the final enzyme-inhibitor complex (EI*) is thought to correlate with closure and ordering of the InhA substrate binding loop. A detailed mechanistic understanding of the molecular basis for residence time in this system will facilitate the development of InhA inhibitors with improved in vivo activity.
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Affiliation(s)
- Pan Pan
- Institute for Chemical Biology & Drug Discovery, Department of Chemistry, Stony Brook, NY 11794-3400
| | - Susan Knudson
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523-2025
| | - Gopal R. Bommineni
- Institute for Chemical Biology & Drug Discovery, Department of Chemistry, Stony Brook, NY 11794-3400
| | - Huei-Jiun Li
- Institute for Chemical Biology & Drug Discovery, Department of Chemistry, Stony Brook, NY 11794-3400
| | - Cheng-Tsung Lai
- Institute for Chemical Biology & Drug Discovery, Department of Chemistry, Stony Brook, NY 11794-3400
- Biochemistry and Structural Biology, Stony Brook, NY 11794-3400
| | - Nina Liu
- Institute for Chemical Biology & Drug Discovery, Department of Chemistry, Stony Brook, NY 11794-3400
| | - Miguel Garcia-Diaz
- Pharmacological Sciences Graduate Program, Stony Brook University, Stony Brook, NY 11794-3400
| | - Carlos Simmerling
- Institute for Chemical Biology & Drug Discovery, Department of Chemistry, Stony Brook, NY 11794-3400
| | | | - Richard A. Slayden
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523-2025
| | - Peter J. Tonge
- Institute for Chemical Biology & Drug Discovery, Department of Chemistry, Stony Brook, NY 11794-3400
- Biochemistry and Structural Biology, Stony Brook, NY 11794-3400
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5
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Huang KC, Gopula B, Kuo TS, Chiang CW, Wu PY, Henschke JP, Wu HL. Rhodium-Catalyzed Asymmetric Addition of Arylboronic Acids to β-Nitroolefins: Formal Synthesis of (S)-SKF 38393. Org Lett 2013; 15:5730-3. [DOI: 10.1021/ol4027599] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kung-Chih Huang
- Department of Chemistry and Instrumentation Center, Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Tingzhou Road Taipei 11677, Taiwan, Republic of China, and ScinoPharm Taiwan, No. 1, Nan-Ke eighth-Road Taiwan Science-Based Industrial Park, Shan-Hua, Tainan County, 74144, Taiwan, Republic of China
| | - Balraj Gopula
- Department of Chemistry and Instrumentation Center, Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Tingzhou Road Taipei 11677, Taiwan, Republic of China, and ScinoPharm Taiwan, No. 1, Nan-Ke eighth-Road Taiwan Science-Based Industrial Park, Shan-Hua, Tainan County, 74144, Taiwan, Republic of China
| | - Ting-Shen Kuo
- Department of Chemistry and Instrumentation Center, Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Tingzhou Road Taipei 11677, Taiwan, Republic of China, and ScinoPharm Taiwan, No. 1, Nan-Ke eighth-Road Taiwan Science-Based Industrial Park, Shan-Hua, Tainan County, 74144, Taiwan, Republic of China
| | - Chien-Wei Chiang
- Department of Chemistry and Instrumentation Center, Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Tingzhou Road Taipei 11677, Taiwan, Republic of China, and ScinoPharm Taiwan, No. 1, Nan-Ke eighth-Road Taiwan Science-Based Industrial Park, Shan-Hua, Tainan County, 74144, Taiwan, Republic of China
| | - Ping-Yu Wu
- Department of Chemistry and Instrumentation Center, Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Tingzhou Road Taipei 11677, Taiwan, Republic of China, and ScinoPharm Taiwan, No. 1, Nan-Ke eighth-Road Taiwan Science-Based Industrial Park, Shan-Hua, Tainan County, 74144, Taiwan, Republic of China
| | - Julian P. Henschke
- Department of Chemistry and Instrumentation Center, Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Tingzhou Road Taipei 11677, Taiwan, Republic of China, and ScinoPharm Taiwan, No. 1, Nan-Ke eighth-Road Taiwan Science-Based Industrial Park, Shan-Hua, Tainan County, 74144, Taiwan, Republic of China
| | - Hsyueh-Liang Wu
- Department of Chemistry and Instrumentation Center, Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Tingzhou Road Taipei 11677, Taiwan, Republic of China, and ScinoPharm Taiwan, No. 1, Nan-Ke eighth-Road Taiwan Science-Based Industrial Park, Shan-Hua, Tainan County, 74144, Taiwan, Republic of China
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6
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Singh KN, Singh P, Singh P, Deol YS. Nucleophilic Addition of β-Amino Carbanions to Arynes: One-Pot Synthesis of 4-Aryl-N-methyl-1,2,3,4-tetrahydroisoquinolines. Org Lett 2012; 14:2202-5. [DOI: 10.1021/ol300360r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kamal Nain Singh
- Department of Chemistry, Panjab University, Chandigarh-160014, India
| | - Paramjit Singh
- Department of Chemistry, Panjab University, Chandigarh-160014, India
| | - Pushpinder Singh
- Department of Chemistry, Panjab University, Chandigarh-160014, India
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7
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Crecente-Campo J, Vázquez-Tato MP, Seijas JA. Direct syntheses of 4-aryl-1,2,3,4-tetrahydroisoquinolines and 1-aryl-2,3,4,5-tetrahydro-3-benzoazepines via hydroamination of enol carbamates. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.01.098] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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am Ende CW, Knudson SE, Liu N, Childs J, Sullivan TJ, Boyne M, Xu H, Gegina Y, Knudson DL, Johnson F, Peloquin CA, Slayden RA, Tonge PJ. Synthesis and in vitro antimycobacterial activity of B-ring modified diaryl ether InhA inhibitors. Bioorg Med Chem Lett 2008; 18:3029-33. [PMID: 18457948 DOI: 10.1016/j.bmcl.2008.04.038] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2007] [Revised: 04/11/2008] [Accepted: 04/15/2008] [Indexed: 10/22/2022]
Abstract
Previous structure-based design studies resulted in the discovery of alkyl substituted diphenyl ether inhibitors of InhA, the enoyl reductase from Mycobacterium tuberculosis. Compounds such as 5-hexyl-2-phenoxyphenol 19 are nM inhibitors of InhA and inhibit the growth of both sensitive and isoniazid-resistant strains of Mycobacterium tuberculosis with MIC(90) values of 1-2 microg/mL. However, despite their promising in vitro activity, these compounds have ClogP values of over 5. In efforts to reduce the lipophilicity of the compounds, and potentially enhance compound bioavailability, a series of B ring analogues of 19 were synthesized that contained either heterocylic nitrogen rings or phenyl rings having amino, nitro, amide, or piperazine functionalities. Compounds 3c, 3e, and 14a show comparable MIC(90) values to that of 19, but have improved ClogP values.
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Affiliation(s)
- Christopher W am Ende
- Institute of Chemical Biology and Drug Discovery, Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
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9
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Filer CN. The synthesis of dopaminergic radioligands labelled with tritium and iodine-125. J Labelled Comp Radiopharm 2007. [DOI: 10.1002/jlcr.1399] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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10
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Sullivan TJ, Truglio JJ, Boyne ME, Novichenok P, Zhang X, Stratton CF, Li HJ, Kaur T, Amin A, Johnson F, Slayden RA, Kisker C, Tonge PJ. High affinity InhA inhibitors with activity against drug-resistant strains of Mycobacterium tuberculosis. ACS Chem Biol 2006; 1:43-53. [PMID: 17163639 DOI: 10.1021/cb0500042] [Citation(s) in RCA: 182] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Novel chemotherapeutics for treating multidrug-resistant (MDR) strains of Mycobacterium tuberculosis (MTB) are required to combat the spread of tuberculosis, a disease that kills more than 2 million people annually. Using structure-based drug design, we have developed a series of alkyl diphenyl ethers that are uncompetitive inhibitors of InhA, the enoyl reductase enzyme in the MTB fatty acid biosynthesis pathway. The most potent compound has a Ki' value of 1 nM for InhA and MIC99 values of 2-3 microg mL(-1) (6-10 microM) for both drug-sensitive and drug-resistant strains of MTB. Overexpression of InhA in MTB results in a 9-12-fold increase in MIC99, consistent with the belief that these compounds target InhA within the cell. In addition, transcriptional response studies reveal that the alkyl diphenyl ethers fail to upregulate a putative efflux pump and aromatic dioxygenase, detoxification mechanisms that are triggered by the lead compound triclosan. These diphenyl ether-based InhA inhibitors do not require activation by the mycobacterial KatG enzyme, thereby circumventing the normal mechanism of resistance to the front line drug isoniazid (INH) and thus accounting for their activity against INH-resistant strains of MTB.
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Affiliation(s)
- Todd J Sullivan
- Department of Chemistry, SUNY Stony Brook, Stony Brook, New York 11794-3400, USA
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11
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Saha SL, Roche VF, Pendola K, Kearley M, Lei L, Romstedt KJ, Herdman M, Shams G, Kaisare V, Feller DR. Synthesis and in vitro platelet aggregation and TP receptor binding studies on bicyclic 5,8-ethanooctahydroisoquinolines and 5,8-ethanotetrahydroisoquinolines. Bioorg Med Chem 2002; 10:2779-93. [PMID: 12057668 DOI: 10.1016/s0968-0896(02)00101-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Eighteen novel bicyclic 1-substituted benzyl octahydro- and tetrahydroisoquinolines were synthesized and evaluated for human thromboxane A(2)/prostaglandin H(2) (TP) receptor affinity and antagonism of TP receptor-mediated platelet aggregation. In both cases, potency depended more on the presence of methoxy groups on the 1-benzyl moiety than on nitrogen substitution or extent of oxidation of the isoquinoline ring system. The most potent of the bicyclic compounds retained the 5,8-ethanooctahydroisoquinoline ring structure of the parent molecule (1) and required the 3,4,5-trimethoxybenzyl substitution pattern found in the well-characterized tetrahydroisoquinoline antiplatelet agent trimetoquinol. Differences in nitrogen substituent SAR were noted between the mono-methoxylated compounds and the 3,4,5-trimethoxybenzyl derivatives.
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Affiliation(s)
- Shankar L Saha
- School of Pharmacy & Allied Health Professions, Creighton University, 2500 California Plaza, Omaha, NE 68005, USA
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12
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13
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Garnes KT, Landvatter SW, Gallagher TF. Synthesis of 4-[2-(4-Azidophenyl)-5-(3-iodo-125I-phenyl)-1H-imidazol-4-yl]pyridine (SB 206718-[125I]), a pyridinyl imidazole cytokine inhibitor. J Labelled Comp Radiopharm 1998. [DOI: 10.1002/(sici)1099-1344(199607)38:7<637::aid-jlcr871>3.0.co;2-t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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14
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Andersen A, Wang S, Thompson RD, Neumeyer JL. Synthesis of potential metabolites of the brain imaging agents methyl (1R,2S,3S,5S)-3-(4-Iodophenyl)-8-alkyl-8-azabicyclo[3.2.1]octane-2-carboxylate. J Heterocycl Chem 1997. [DOI: 10.1002/jhet.5570340541] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Yang ZY, Perry B, Mukherjee J. Fluorinated benzazepines: 1. Synthesis, radiosynthesis and biological evaluation of a series of substituted benzazepines as potential radiotracers for positron emission tomographic studies of dopamine D-1 receptors. Nucl Med Biol 1996; 23:793-805. [PMID: 8940723 DOI: 10.1016/0969-8051(96)00076-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We have prepared N-alkyl, aryl, fluoroalkyl, fluoroaryl and iodoaryl derivatives of 7-chloro-8-hydroxy-3-methyl-1-(3'-aminophenyl)-2,3,4,5-tetrahydro-1 H-3-benzazepine (SCH 38548) as high-affinity ligands for the dopamine D1 receptor. Binding affinities of the compounds for dopamine D1, D2, and serotonin 5-HT2 receptor sites in rat brain homogenates were measured. The affinity of SCH 38548 for dopamine D1 receptors was found to be 0.53 +/- 0.46 nM, whereas lower affinities (in the micromolar range) for dopamine D2 and serotonin 5-HT2 receptors were found. Alkylation (ethyl, n-propyl and benzyl) and acylation (benzoyl) of the amino group of SCH 38548 did not decrease affinities for the D1 receptors significantly. The fluoroethyl, fluoropropyl, and fluorobenzyl derivatives showed approximately an 8-fold, 9-fold, and 3-fold decrease in affinity for the D1 sites compared to SCH 38548. The N-4-fluorobenzoyl derivative, however, showed a similar affinity for the D1 sites as for SCH 38548. All four fluorinated derivatives exhibited weak binding at D2 and serotonin 5-HT2 receptors. The N-(4-18F-fluorobenzoyl)SCH 38548 was prepared by reacting SCH 38548 with 4-18F-fluorobenzoyl fluoride in 2-5% radiochemical yield with a specific radioactivity of approximately 600-700 Ci/mmol. The N-(3-18F-fluoropropyl)SCH 38548 was prepared by reacting SCH 38548 with 18F-fluoropropyl iodide in 2-5% radiochemical yield with a specific radioactivity of approximately 600-700 Ci/mmol. N-(4-18F-fluorobenzoyl)SCH 38548 failed to localize in the dopaminergic sites in the rat and rhesus monkey brain. Biodistribution of N-(3-18F-fluoropropyl)SCH 38548 in rats showed specific uptake and retention (0.64% injected dose/g at 30 min) of the radiotracer in the striata, with striata-to-cerebellum ratios reaching 12 at 2 h postinjection (p.i.). Positron emission tomography scans in rheusus monkeys indicate selective uptake of the radiotracer in the striata. After IV injection of N-(3-18F-fluoropropyl)SCH 38548, a rapid brain uptake of the tracer from blood was observed. Initial uptake in the striata and cerebellum was approximately 0.02% of injected dose/cc. Nonspecific uptake from the tissue surrounding the striata cleared slowly. The striata-to-cerebellum ratio increased from 1.20 to 3.5 min postinjection to approximately 2.5 at 120 min p.i. The specific uptake of N-(3-18F-fluoropropyl)SCH 38548 in the striata was displaced by IV administration of SCH 24518 (2 mg/kg).
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Affiliation(s)
- Z Y Yang
- Franklin McLean Institute, Department of Radiology, University of Chicago, IL 60637 USA
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16
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Mach RH, Elder ST, Morton TE, Nowak PA, Evora PH, Scripko JG, Luedtke RR, Unsworth CD, Filtz T, Rao AV. The use of [18F]4-fluorobenzyl iodide (FBI) in PET radiotracer synthesis: model alkylation studies and its application in the design of dopamine D1 and D2 receptor-based imaging agents. Nucl Med Biol 1993; 20:777-94. [PMID: 8401379 DOI: 10.1016/0969-8051(93)90165-q] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
[18F]4-Fluorobenzyl iodide ([18F]FBI) was prepared, and a series of model alkylation studies were conducted to determine its chemical reactivity toward nitrogen and sulfur nucleophiles of varying nucleophilicities. [18F]FBI was found to react rapidly with secondary amines and anilines to give the corresponding N-[18F]4-fluorobenzyl analogue in high yield. Amides and thiol groups required the use of a base catalyst. The utility of [18F]FBI was documented by investigation of dopamine D1 and D2 receptor-based radiotracers.
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Affiliation(s)
- R H Mach
- Cerebrovascular Research Center, University of Pennsylvania, Philadelphia 19104-6063
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Neumeyer JL, Baindur N, Bakthavachalam V, Yuan J, Madras BK, Kula NS, Campbell A, Baldessarini RJ. Selective probes for characterization of dopamine D1 and D2 receptors. Neurochem Int 1992; 20 Suppl:63S-68S. [PMID: 1365458 DOI: 10.1016/0197-0186(92)90212-a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Billings JJ, Kung MP, Chumpradit S, Mozley D, Alavi A, Kung HF. Characterization of radioiodinated TISCH: a high-affinity and selective ligand for mapping CNS D1 dopamine receptor. J Neurochem 1992; 58:227-36. [PMID: 1530770 DOI: 10.1111/j.1471-4159.1992.tb09300.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In developing CNS D1 dopamine receptor-imaging agents with improved specificity and longer brain retention, an iodinated D1 ligand was synthesized. In vitro and in vivo radiolabeling studies of a new iodinated benzazepine, TISCH [7-chloro-8-hydroxy-1-(3'-iodophenyl)-3-methyl-2,3,4,5-tetrahydro-1H-3- benzazepine], an analog of SCH 23390 (7-chloro-8-hydroxy-3-methyl-1-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepin e), were investigated. After an intravenous injection, the R(+) isomer of TISCH showed high brain uptake in rats (2.20 and 0.57% dose per whole brain at 2 and 60 min, respectively). The striatum/cerebellum ratio increased progressively with time (12 at 60 min). Ex vivo autoradiography of rat brain sections, after intravenous injection of R(+)-[125I]TISCH, displayed the highest uptake in striatum and substantia nigra, regions known to have a high concentration of D1 receptors, whereas the S(-) isomer displayed no specific uptake. Furthermore, the specific uptake can be blocked by pretreatment with SCH 23390. In vitro binding studies using the rat striatum tissue preparation showed high specific and low nonspecific bindings (KD = 0.21 +/- 0.03 nM). The rank order of potency exhibiting high specificity to the D1 receptor was SCH 23390 greater than (+/-)-TISCH greater than (+)-butaclamol = (+/-)-FISCH [7-chloro-8-hydroxy-1-(4'-iodophenyl)-3-methyl-2,3,4,5-tetrahydro-1 H-3-benzazepine] much greater than WB4101 = spiperone greater than dopamine, serotonin, (+/-)-propranolol, and naloxone. Imaging studies in a monkey with the resolved isomer, R(+)-[123I]TISCH, demonstrated a high uptake in the basal ganglia and prolonged retention. The preliminary data suggest that R(+)-TISCH is selective for the CNS D1 receptor and is potentially useful for in vivo and in vitro pharmacological studies. When labeled with iodine-123, it may be suitable for noninvasive imaging in humans.
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Affiliation(s)
- J J Billings
- Department of Radiology, University of Pennsylvania, Philadelphia 19104
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