A conventional method for the preparation of new precursor of no-carrier-adde O-(2-[18F]fluoroethyl)-L-tyrosine

摘要

This is a new precursor and new method for the synthesis of no-carrier-added O -(2-[ 18 F]fluoroethyl)-L-Tyrosine which has been proved a suitable PET (position emission tomography) probe for tumor diagnosis imaging. The preparation of the title compound starts from precursors with the chemical structures as in Formula 1, wherein R 1 is a protective group for the carboxyl functional group, R 2 is a protective group for the amino group, and R 3 acts as a leaving group. R 1 represents an arylalkyl group, R 2 represents a carboxyl group, and R 3 represents a p -tosyloxy, methane sulfonyloxy or trifluoromethane sulfonyloxy or bromine. The invention includes a method for the syntheses of new precursors with the chemical structures as in Formula 1.
Formula 1 : Synthesis precursors for O -(2-[ 18 F]fluoroethyl)-L-Tyrosine.