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, cis-positioned, 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.
本发明提供了式(I)的放射性
金属杂配合物:[(Me=N-R)L1
L2]+Z-,其中Me、R、L1、
L2和Z-的含义如说明书中所示。这些配合物包括一个三价放射性
金属-
亚胺基团,通常是
钼或
锇-
亚胺基团,由辅助三齿杂双
膦配体L1强烈稳定,这使得形成了取代惰性[(Me=N-R)L1]基团。这样的基团固定在一个中间体[(Me=N-R)Y2L1)]+化合物中,其中含有两个易位、顺式定位的Y
配体,其中Y最好是卤素基团。后者易于被双齿
配体L2取代,形成最终的[(Me=N-R)L1
L2]+Z-杂配合物。本发明的复合物可用于制备放射性药物:事实上,
生物活性片段可以被引入到
L2框架或
亚胺基团R上,从而赋予
生物靶向性。