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• W2025077146 abstract "A Resin-linker-vector (RLV) strategy is described for the radiosynthesis of tracer molecules containing the radionuclide 18F, which releases the labelled vector into solution upon nucleophilic substitution of a polystyrene-bound arylsulfonate linker with [18F]-fluoride ion. Three model linker-vector molecules 7 a–c containing different alkyl spacer groups were assembled in solution from (4-chlorosulfonylphenyl)alkanoate esters, exploiting a lipase-catalysed chemoselective carboxylic ester hydrolysis in the presence of the sulfonate ester as a key step. The linker-vector systems were attached to aminomethyl polystyrene resin through amide bond formation to give RLVs 8 a–c with acetate, butyrate and hexanoate spacers, which were characterised by using magic-angle spinning (MAS) NMR spectroscopy. On fluoridolysis, the RLVs 8 a, b containing the longer spacers were shown to be more effective in the release of the fluorinated model vector (4-fluorobutyl)phenylcarbamic acid tert-butyl ester (9) in NMR kinetic studies and gave superior radiochemical yields (RCY≈60 %) of the 18F-labelled vector. The approach was applied to the synthesis of the radiopharmaceutical O-(2-[18F]-fluoroethyl)-L-tyrosine ([18F]-FET), delivering protected [18F]-FET in >90 % RCY. Acid deprotection gave [18F]-FET in an overall RCY of 41 % from the RLV." @default.
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• W2025077146 date "2012-12-19" @default.
• W2025077146 modified "2023-09-25" @default.
• W2025077146 title "A Resin-Linker-Vector Approach to Radiopharmaceuticals Containing¹⁸F: Application in the Synthesis of<i>O</i>-(2-[¹⁸F]-Fluoroethyl)-<scp>L</scp>-tyrosine" @default.
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• W2025077146 doi "https://doi.org/10.1002/chem.201202474" @default.
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