title: Semiautomatic synthesis of 3'-deoxy-3'-[18F]fluorothymidine using three precursors.
abstract: To facilitate clinical studies with [18F]FLT, we modified 2-vessel [18F]FDG synthesis module (manufactured by CTI) to produce [18F]FLT. Three thymidine derivatives were used as precursors for [18F]FLT synthesis. Among these precursors, 3-N-t-butoxycarbonyl-[5'-O-(4,4'-dimethoxytrityl)-2'-deoxy-3'-O-(4-nitrobenzenesulfonyl)-beta-D-threopentofuranosyl]thymine (thymidine derivative II) gave the best radiochemical yield (37.9%) when the reaction was carried out at 140 degrees C for 5 min. This semiautomatic synthesis system was not only simple and convenient, but also showed good reproducibility. The total synthesis time was 50 minutes from the end of bombardment (EOB) by the use of this modified synthesizer (including the manual process).
authors.affiliation: Department of Nuclear Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
authors.forename: Bao
authors.initials: B
authors.lastname: Teng
authors.forename: Shizhen
authors.initials: S
authors.lastname: Wang
authors.forename: Zhe
authors.initials: Z
authors.lastname: Fu
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Dang
authors.forename: Zhanhong
authors.initials: Z
authors.lastname: Wu
authors.forename: Liqin
authors.initials: L
authors.lastname: Liu
mesh_terms: D002849:Chromatography, Gas; D015224:Dideoxynucleosides / Q000138:chemical synthesis*; D005462:Fluorine Radioisotopes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D049268:Positron-Emission Tomography / Q000379:methods; D019275:Radiopharmaceuticals / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D015224:Dideoxynucleosides; D005462:Fluorine Radioisotopes; D019275:Radiopharmaceuticals; C002854:alovudine