Stabilization of the N-1-substituted cytosinate iminooxo form in dinuclear palladium complexes
摘要:
The synthesis, as well as chemical and structural characterization, of 1-(p-toluenesulfony)cytosine (1) and its dinuclear complexes Of the composition Pd-2(1-TosC(-)-N3,N4)(4) (3) and Pd-2(1-TosC-N3,N4)(2)DMSO2Cl2 (4) by means of ESI-MS, IR, H-1 NMR and X-ray single crystal analysis are described. Ligand 1 exists in the preferred amintooxo tautomeric form, while both dinuclear complexes reveal the presence of the iminooxo form of the ligand, where 1-TosC(-) stands for the anion of the cytosine derivative of 1, bridging two palladium atoms. Complex 3 has a paddlewheel structure with two square-planar coordination spheres, consisting of four N atoms each, mutually parallel and perpendicular to the interpalladium vector. Complex 4 is characterized by two mutually parallel square-planar coordination spheres consisting of two nitrogens, sulfur from the solvent molecule and a chloride. A feasible chemical route for the formation of 3 and 4 via the kinetically favoured mononuclear complex Pd(1-TosC-N3)(2)Cl-2 (2) is proposed, based on the IR, H-1 NMR, mass spectrometry, elemental analysis and X-ray structure analysis data. (C) 2009 Elsevier Ltd. All rights reserved.
sulfonylated cytosine nucleobase has been developed. First, novel N1-sulfonylcytosine derivatives 3–6 were prepared by the condensation of silylated cytosine with selected sulfonyl chlorides. They were subsequently transformed to 5-morpholinomethyl-N1-sulfonylcytosine derivatives (8, 12–15) using microwave irradiation. As a result of cytosine ringopening in N1-tosylcytosine, depending on the reaction conditions
priority had the cyclam portion of the ligand 2. The structure of the formed Zn2+ complexes with ligand 2 depended on the number of 3° amines within the cyclam portion of the conjugate and the ratio of the metal:ligand used. The cleavage of the cyclam ring of metal complexes is driven by the formation of the fragment that suited the coordinating demand of the metal ions and the collision energy applied
Synthesis of the sulfonylpyrimidine derivatives with anticancer activity
申请人:Herbos d.d.
公开号:EP0877022A1
公开(公告)日:1998-11-11
This invention relates to the processes for the preparation of unknown N-1 sulfonyl and N-1,NH-4 disulfonyl derivatives of pyrimidine nucleo bases, general formulae I, II, III, IV, V and VI, and their biological activity.
This type of compounds exhibits strong anticancer activity in vitro on different tumor cell lines whereas cytostatic behavior on normal human fibroblasts is much less pronounced.