Racemic 1-[3-(5-methoxy-1,2,3,4-tetrahydro-1-naphtalenyl) propyl]-4- phenylpiperazine (PNU-157760) was labeled with carbon-11 (t( 1/4 ) = 20.4 min) as a putative radioligand for the noninvasive assessment of 5-HT(1A) receptors in vivo with positron emission tomography (PET). The radiochemical synthesis consisted of O-methylation of desmethyl precursor with [11C]methyl iodide in the presence of potassium tert-butoxide in DMF. The desmethyl precursor for the radiosynthesis of [11C]PNU-157760, was prepared by a convenient one-step demethylation of PNU-157760 with boron tribromide. (R,S)-[O-Methyl-11C]-1-[3-(5-methoxy-1,2,3,4-tetrahydro-1- naphtalenyl)propyl]-4-phenylpiperazine with >99% radiochemical purity was obtained in 30 min with a radiochemical yield of 10 ± 5% (EOS, nondecay corrected) and a specific radioactivity of 2.5 ± 1 Ci/μmol. Biodistribution studies in rats showed that [11C]PNU-157760 readily crosses the blood- brain barrier with a maximum of brain uptake at 30 min after injection; however, the low specific-to-nonspecific binding ratio in vivo as evidenced by the low hippocampus/cerebellum uptake ratio (1.17 at 60 min postinjection) does not make [11C]PNU-157760 a promising radioligand for serotonin 5- HT(1A) receptors.

Synthesis and biodistribution of (R,S)-[O-methyl-C-11]-1-[3-(5-methoxy-1,2,3,4-tetrahydro-1-naphtalenyl)p ropyl]-4-phenylpiperazine (PNU-157760), a putative radioligand for 5-HT1A receptors / M. Matarrese, D. Soloviev, R. Moresco, V. Ferri, P. Simonelli, F. Magni, D. Colombo, S. Todde, A. Carpinelli, F. Fazio, M. Kienle. - In: BIOORGANIC CHEMISTRY. - ISSN 0045-2068. - 26:2(1998), pp. 91-102.

Synthesis and biodistribution of (R,S)-[O-methyl-C-11]-1-[3-(5-methoxy-1,2,3,4-tetrahydro-1-naphtalenyl)p ropyl]-4-phenylpiperazine (PNU-157760), a putative radioligand for 5-HT1A receptors

D. Colombo;
1998

Abstract

Racemic 1-[3-(5-methoxy-1,2,3,4-tetrahydro-1-naphtalenyl) propyl]-4- phenylpiperazine (PNU-157760) was labeled with carbon-11 (t( 1/4 ) = 20.4 min) as a putative radioligand for the noninvasive assessment of 5-HT(1A) receptors in vivo with positron emission tomography (PET). The radiochemical synthesis consisted of O-methylation of desmethyl precursor with [11C]methyl iodide in the presence of potassium tert-butoxide in DMF. The desmethyl precursor for the radiosynthesis of [11C]PNU-157760, was prepared by a convenient one-step demethylation of PNU-157760 with boron tribromide. (R,S)-[O-Methyl-11C]-1-[3-(5-methoxy-1,2,3,4-tetrahydro-1- naphtalenyl)propyl]-4-phenylpiperazine with >99% radiochemical purity was obtained in 30 min with a radiochemical yield of 10 ± 5% (EOS, nondecay corrected) and a specific radioactivity of 2.5 ± 1 Ci/μmol. Biodistribution studies in rats showed that [11C]PNU-157760 readily crosses the blood- brain barrier with a maximum of brain uptake at 30 min after injection; however, the low specific-to-nonspecific binding ratio in vivo as evidenced by the low hippocampus/cerebellum uptake ratio (1.17 at 60 min postinjection) does not make [11C]PNU-157760 a promising radioligand for serotonin 5- HT(1A) receptors.
5-HT(1A) antagonist; [11C]PNU-157760; Biodistribution; PET; Radiosynthesis; Rats; Serotonin receptor
Settore BIO/10 - Biochimica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/183597
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