Abstract
The possibility of using 2-[18F]fluoroethyl bromide ([18F]FEB) as labeled reagent for selective O-[18F]fluoroethylation of phenolic group in the presence of an unprotected amino group in an amino acid molecule was demonstrated by the example of the synthesis of O-(2′-[18F]fluoroethyl)-L-tyrosine ([18F]FET), one of the most promising PET radiotracers for evaluating the rate of transport of amino acids into a tumor tissue. The labeled reagent was prepared by [18F]fluorination of 2-bromoethyl tosylate with the complex [K/K2.2.2]/[18F] in o-dichlorobenzene (110°C, 10 min) and was transferred with a nitrogen flow into a solution of the substrate (L-tyrosine, NaOH, dimethyl sulfoxide or dimethyl sulfoxide/o-dichlorobenzene). The reaction with the substrate was performed for 20 min at 100°C; the degree of O-[18F]fluoroethylation was 75%. [18F]FET was prepared with a high radiochemical purity (>95%); the total synthesis time, including HPLC purification, was 60 min, and the unoptimized radiochemical yield (corrected for the radioactive decay) was about 20%. The synthesis was performed with an Anatech RB-86 laboratory robot.
Similar content being viewed by others
References
Hamacher, K., Coenen, H.H., and Stocklin, G., J. Nucl. Med., 1986, vol. 27, pp. 235–238.
Lasne, M.-C., Perrio, C., Rouden, J., et al., Top. Curr. Chem., 2002, vol. 222, pp. 203–258.
Zhang, M.-R., Tsuchiyama, A., Haradahira, T., et al., Appl. Radiat. Isot., 2002, vol. 57, pp. 335–342.
Lu, S.-Y., Chin, F.T., McCarron, J.A., and Pike, V.W., J. Label. Comp. Radiopharm., 2004, vol. 47, pp. 289–297.
Wester, H.J., Herz, M., Weber, W., et al., J. Nucl. Med., 1999, vol. 40, no. 1, pp. 205–212.
Pauleit, D., Floeth, F., Tellmann, L., et al., J. Nucl. Med., 2004, vol. 45, no. 3, pp. 374–381.
Pauleit, D., Stoffels, G., Schaden, W., et al., J. Nucl. Med., 2005, vol. 46, no. 3, pp. 411–416.
Spaeth, N., Wyss, M.T., Weber, B., et al., J. Nucl. Med., 2004, vol. 45, no. 11, pp. 1931–1938.
Popperl, G., Gotz, C., and Rachinger, W., Eur. J. Nucl. Med. Mol. Imag., 2004, vol. 31, no. 11, pp. 1464–1470.
Rau, F.C., Weber, W.A., Wester, H.J., et al., Eur. J. Nucl. Med. Mol. Imag., 2002, vol. 29, no. 8, pp. 1039–1046.
Kaim, A.H., Weber, B., Kurrer, M.O., et al., Eur. J. Nucl. Med. Mol. Imag., 2002, vol. 29, no. 5, pp. 648–654.
Tang, G., Tang, X., Wang, M., et al., J. Label. Comp. Radiopharm., 2003, vol. 46, pp. 661–668.
Hamacher, K. and Coenen, H.H., Appl. Radiat. Isot., 2002, vol. 57, pp. 853–856.
Comargic, S., Piel, M., Schirrmacher, R., et al., Appl. Radiat. Isot., 2002, vol. 56, pp. 847–851.
Zhang, M.-R., Furutsuka, K., Yoshida, Y., and Susuki, K., J. Label. Comp. Radiopharm., 2003, vol. 46, pp. 587–598.
Gomzina, N.A., Vassiliev, D.A., Fedorova, O.S., and Krasikova, R.N., Abstracts of Papers, X Turku PET Symp., Turku (Finland), 2005, p. 62.
Kochi, J.K., Singleton, D.M., and Andrews, L.J., Tetrahedron, 1968, vol. 24, no. 8, pp. 3503–3515.
Swartz, F., Recl. Trav. Chim. Pays-Bas, 1914, vol. 33, pp. 252–262.
Gomzina, N.G., Vasil’ev, D.A., and Krasikova, R.N., Radiokhimiya, 2002, vol. 44, no. 4, pp. 366–372.
Gomzina, N.A., Zaitsev, V.V., and Krasikova, R.N., J. Label. Comp. Radiopharm., 2001, vol. 44, suppl. 1, pp. 515–517.
Henriksen, G., Heiz, M., Schwaiger, M., and Wester, H.-J., J. Label. Comp. Radiopharm., 2005, vol. 48, pp. 771–779.
Wadsak, W., Mitterhouser, M., Mien, L.-K., et al., J. Label. Comp. Radiopharm., 2003, vol. 46, pp. 1229–1240.
Zhang, M.-R., Maeda, J., Ogawa, M., et al., J. Med. Chem., 2004, vol. 47, pp. 2228–2235.
Karwath, P., Sartor, J., et al., J. Label. Comp. Radiopharm., 2001, vol. 44, suppl. 1, pp. 877–879.
De Vries, E.F.J., Vroegh, V., Elsinga, P.H., and Vaalburg, W., Appl. Radiat. Isot., 2003, vol. 58, pp. 469–476.
Solar, S.L. and Schumaker, R.R., J. Org. Chem., 1966, vol. 31, pp. 1996–1997.
Author information
Authors and Affiliations
Additional information
Original Russian Text © N.A. Gomzina, D.A. Vasil’ev, R.N. Krasikova, 2007, published in Radiokhimiya, 2007, Vol. 49, No. 3, pp. 264–269.
Rights and permissions
About this article
Cite this article
Gomzina, N.A., Vasil’ev, D.A. & Krasikova, R.N. Use of 2-[18F]fluoroethyl bromide in synthesis of O-(2′-[18F]fluoroethyl)-L-tyrosine, a radiotracer for PET diagnostics of brain tumors. Radiochemistry 49, 299–304 (2007). https://doi.org/10.1134/S1066362207030174
Received:
Issue Date:
DOI: https://doi.org/10.1134/S1066362207030174