E-viri
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Satyamurthy, N; Barrio, J R; Bida, G T; Huang, S C; Mazziotta, J C; Phelps, M E
International journal of radiation applications and instrumentation. Part A, Applied radiation and isotopes, 1990, Letnik: 41, Številka: 2Journal Article
The synthesis of 3-(2'-18Ffluoroethyl)spiperone (1c), a radiotracer useful for imaging the brain dopamine receptor system in vivo using positron emission tomography, is described. Precursors of 1c, the functional 3-N-alkyl derivatives of spiperone (4), were prepared by the alkylation of the amide group in spiperone (2a) by 1,2-disubstituted ethanes under phase transfer conditions. A comprehensive evaluation of the reaction of the derivatives 4a-h with no-carrier-added K18F/Kryptofix clearly indicated that the ketalized derivatives 4e-h were the choice of the precursors for 1c. The i.r., MS and NMR spectral data suggested that under phase transfer reaction conditions, the amide nitrogen was preferentially alkylated. To provide a firm basis for comparison with related analogues, an x-ray analysis was performed on a single crystal of 3-(2'-fluoroethyl)spiperone (1d). The tomographic behavior of 1c in human brain tissue was measured for more than 7 h and was consistent with the labeling of dopamine D-2 receptors.
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in: SICRIS
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