[C-11]ALX-5407, R-N[3-(4'-fluorophenyl)-3-(4'-phenylphenoxy)propyl] sarcosi
ne, a chiral glycine transporter 1 antagonist, was labeled with [C-11]iodom
ethane by N-alkylation of methyl ester protected N-normethyl precursor, ALX
-5536, and subsequent saponification of the methyl ester protecting group.
The time for synthesis, purification, and formulation was 33 minutes with a
n average specific radioactivity of 3909 mCi/mu mol (EOS) and average decay
corrected radiochemical yield of 8%.