Diazenide and hydrazide(2−) derivatives of the [Re(CO)<sub>3</sub>]<sup>+</sup>core
作者:Roger Alberto、Andrew R. Cowley、Jonathan R. Dilworth、Paul S. Donnelly、Jennifer Pratt
DOI:10.1039/b407708c
日期:——
Reaction of [ReBr3(CO)3]2â with aryldiazonium salts gives the Re(III) diazenide complexes [ReBr2(NNC6H4R-4)(CO)2]â. The attachment of a PhNHCS tethering group to pyridyl hydrazine generates a HYNIC related proligand which gives a stable chelated pyridyliumthiocarbazide(2â) derivative of the [Re(I)(CO)3]+ core.
Pyridylthiocarbazide complexes of rhenium with potential radiopharmaceutical applications
作者:Carole Clarke、Andrew R. Cowley、Jonathan R. Dilworth、Paul S. Donnelly
DOI:10.1039/b406439a
日期:——
Attachment of a thioamide tethering group provides a modification of the well-known pyridylhydrazine based route to radiolabelling of biomolecules (the HYNIC system) and gives a proligand which gives stable, well-defined chelated derivatives with both Re(V) oxo and Re(III) diazenide cores. Both display previously unknown bonding modes for the pyridylthiocarbazide ligands.
A simple protocol for the synthesis of 3-amino-[1,2,4]triazolo[4,3-a]pyridines is reported. The newly developed one-pot methodology involves the reaction of hydrazinopyridine with isothiocyanates to give the corresponding thiosemicarbazides, which are further desulfurized in situ using polymer-supported Mukaiyama's reagent to promote the final cyclization and formation of the central core. Aryl isothiocyanates bearing both electron-donating and electron-withdrawing groups are well tolerated, and the expected compounds were obtained in excellent purities and yields after removal of salts with a SPE-NH2 column. This methodology proved to be robust in the extension to 3-amino-[1,2,4]triazolo[4,3-a]-pyrazines and 3-amino-[1,2,4]triazolo[4,3-c]-pyrimidines, and no significant differences were noticed in terms of purities and yields. The straightforward protocol developed, mix,filler, and evaporate, is appropriate for performing multiple reactions in parallel fashion without need of purification.
Fouda, A. S.; Shawagfeh, S. T., Bulletin de la Societe Chimique de France, 1991, # 1, p. 30 - 34
作者:Fouda, A. S.、Shawagfeh, S. T.
DOI:——
日期:——
Ibrahim, K. M.; El-Reash, G. M. Abu; Khalifa, M. E., Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry, 1992, vol. 22, p. 1159 - 1168
作者:Ibrahim, K. M.、El-Reash, G. M. Abu、Khalifa, M. E.