Synthesis and biological evaluation of radiolabeled beta-ruthenocenylalanine

Carrier-free beta-[103,106Ru] ruthenocenylalanine was prepared from 103, 106RuCl3 by utilizing ( ruthenocenylmethyl )trimethylammonium iodide as the key synthetic intermediate. The amino acid analogue was evaluated as a pancreatic imaging agent, but no selective uptake in the pancreas was observed in either rats or mice.