| 摘要 |
The present invention provides radioactive metal heterocomplexes of formula (I): [(Me=N-R) L1L2] +Z- (I), wherein Me, R, L1 L2 and Z- have the meanings indicated in the description. The complexes include a trivalent radioactive metal-imido group, typically a technetium- or rhenium-imido group, strongly stabilized by the presence of an ancillary tridentate hetero-diphosphine ligand L1, which allows the formation of substitution-inert [(Me=N-R)L1] moieties. Such moieties are fixed in an intermediate [(Me=N-R)Y2L1)]+ compound which contains two labile, cispositioned, Y ligands, where Y is preferably an halide group. The latter are easily replaced by a bidentate ligand L2 to give the final [(Me=N-R)L1L2]+ Z-heterocomplexes. The complexes of the invention are useful for the preparation of radiopharmaceuticals: in fact, a bioactive fragment which confers biological target-seeking properties can be introduced either on the L2 framework or the imido R group.
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