| Synthesis and preliminary evaluation of (R,S)-1-[2-((carbamoyl-4-hydroxy)phenoxy)-ethylamino]-3-[4-(1-[11C]-met hyl-4-trifluoromethyl-2-imidazolyl)phenoxy]-2-propanol ([11C]CGP 20712A) as a selective beta 1-adrenoceptor ligand for PET. | |
MedLine Citation:
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PMID: 9234285 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The most selective beta 1-adrenoceptor ligand known at this moment is (S)-1-[2-((carbamoyl-4-hydroxy) phenoxy)ethylamino]-3-[4-(1-methyl-4-trifluoromethyl-2-imidazolyl) phenoxy]-2-propanol (CGP 26505), the S-isomer of CGP 20712A. We prepared the racemic 11C analogue by methylation with [11C]CH3I of the corresponding desmethyl compound using a microwave oven to accelerate the reaction. Several radioactive by-products (about 70% of the non-volatile radioactive products) were formed. After HPLC purification [11C]CGP 20712A with a specific activity of 35 TBq/mmol was dissolved in a propylene glycol-ethanol-saline mixture to prepare it for injection. The total preparation time was 35 min. The radiochemical yield was 5% (calculated from [11C]CH3I, not corrected for decay). The identity of [11C]CGP 20712A was proved by liquid chromatography-mass spectrometry (LC-MS). Tissue distribution studies in male Wistar rats have been performed. At 20 min after injection of the radioligand (0.1 nmol) the DAR [differential absorption ratio = (counts per minute recovered/g tissue)/(counts per min injected/g body weight)] in heart tissue decreased significantly (P < 0.005) from 1.84 +/- 0.11 to 1.21 +/- 0.12 after blocking of beta-adrenoceptors with 500 micrograms (R,S)-propranolol. A preliminary PET study in a Wistar rat showed maximal uptake in the time frame 10-20 min after injection. The ratio of specific/non-specific binding at this interval was 2.6. |
Authors:
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P H Elsinga; A Van Waarde; G M Visser; W Vaalburg |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Nuclear medicine and biology Volume: 21 ISSN: 0969-8051 ISO Abbreviation: Nucl. Med. Biol. Publication Date: 1994 Feb |
Date Detail:
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Created Date: 1997-09-25 Completed Date: 1997-09-25 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9304420 Medline TA: Nucl Med Biol Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 211-7 Citation Subset: IM |
Affiliation:
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PET Center and Groningen Center for Catalysis and Synthesis, University Hospital, The Netherlands. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adrenergic beta-Antagonists
/
chemical synthesis*,
metabolism Animals Carbon Radioisotopes / diagnostic use Evaluation Studies as Topic Imidazoles / chemical synthesis*, metabolism Male Molecular Structure Radioligand Assay Rats Rats, Wistar Tissue Distribution / physiology Tomography, Emission-Computed* |
| Chemical | |
Reg. No./Substance:
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0/Adrenergic beta-Antagonists; 0/Carbon Radioisotopes; 0/Imidazoles; 81015-67-0/CGP 20712A |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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