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With.OCH2CO. as a linker, a non β-substituted cationic bisporphyrin (4a) and a β-substituted cationic bisporphyrin (4b) were prepared through methylation of the intermediate which was obtained from β-amino-5,10,15,20- tetra (4-cyanophenyl) porphyrin or 5-hydroxylphenyl-10,15,20-tris(4-cyanophenyl) reacting with 5-hydroxy-10,15,20-trispyridinylporphyrin. Their structures were confirmed by 1H NMR, IR, UV-vis, MS and elemental analysis. DNA photocleavage ability and the singlet oxygen ability of those cationic bisporphyrins were investigated. DNA photocleavage activity of β-substituted cationic bisporphyrin was significantly weaker than that of H2TMPyP, but similar to that of non β-substituted cationic bisporphyrin. While 4a and 4b showed substantial photocleavage activities toward DNA, with 68% and 66% observed at 10 μM. The assessment of indirectly measured 1O2 production rates against H2TMPyP were described and the relative singlet oxygen production yields were: free cationic bisporphyrins < H2TMPyP. The results showed the cationic bisporphyrins with β-substitution and non β-substitution could be developed as potential photodynamic agents.

Synthesis, DNA Photocleavage and Singlet Oxygen Measurement of Cationic Bisporphyrins