Core-modified porphyrins. Part 4: Steric effects on photophysical and biological properties in vitro
摘要:
21,23-Dithiaporphyrins (2-10) were designed and prepared as analogues of 5,20-diphenyl-10,15-bis(4-carboxylatomethoxy)phenyl-21,23-dithiaporphyrin (1) to examine the impact of steric bulk at the 5- and 20-meso positions as well as the impact of symmetry. Changes at the meso positions had minimal impact on the UV-vis-near-IR absorption spectra, quantum yields for the generation of singlet oxygen, and quantum yields for fluorescence and some impact on values of the octanol/water partition coefficient. Of the compounds 1-10, 5-phenyl-20-(2-thienyl)-10,15-bis-(4-carboxylatomethoxy-phenyl)-21,23-dithiaporphyrin (3) showed the greatest phototoxicity toward cultured R3230AC cells, with 68% cell kill at 1 x 10(-7) M and irradiation with 5 J cm(-2) of 350-750 nm light. Results in this study suggest that smaller substituents on the meso ring and less symmetrical compounds are more effective as photosensitizers than compounds with two bulky substituents at adjoining meso sites and a higher symmetry. The mitochondria appear to be involved in the process of phototoxicity as determined by the inhibition of whole cell cytochrome c oxidase activity in cells treated with 3 and light. No impact upon mitochondrial cytochrome c oxidase activity was observed in cells treated with 3 and no light. Fluorescence microscopy studies suggest that the mitochondria are not initial sites of accumulation of 3. (c) 2004 Elsevier Ltd. All rights reserved.
Core-modified porphyrins. Part 4: Steric effects on photophysical and biological properties in vitro
摘要:
21,23-Dithiaporphyrins (2-10) were designed and prepared as analogues of 5,20-diphenyl-10,15-bis(4-carboxylatomethoxy)phenyl-21,23-dithiaporphyrin (1) to examine the impact of steric bulk at the 5- and 20-meso positions as well as the impact of symmetry. Changes at the meso positions had minimal impact on the UV-vis-near-IR absorption spectra, quantum yields for the generation of singlet oxygen, and quantum yields for fluorescence and some impact on values of the octanol/water partition coefficient. Of the compounds 1-10, 5-phenyl-20-(2-thienyl)-10,15-bis-(4-carboxylatomethoxy-phenyl)-21,23-dithiaporphyrin (3) showed the greatest phototoxicity toward cultured R3230AC cells, with 68% cell kill at 1 x 10(-7) M and irradiation with 5 J cm(-2) of 350-750 nm light. Results in this study suggest that smaller substituents on the meso ring and less symmetrical compounds are more effective as photosensitizers than compounds with two bulky substituents at adjoining meso sites and a higher symmetry. The mitochondria appear to be involved in the process of phototoxicity as determined by the inhibition of whole cell cytochrome c oxidase activity in cells treated with 3 and light. No impact upon mitochondrial cytochrome c oxidase activity was observed in cells treated with 3 and no light. Fluorescence microscopy studies suggest that the mitochondria are not initial sites of accumulation of 3. (c) 2004 Elsevier Ltd. All rights reserved.
A series of meso-thienyl-substituted porphyrins with different porphyrin cores such as N3S, N2S2 and N3O were synthesized and characterized. The thienyl groups at the meso-carbon atoms change the electronic properties of the porphyrinring. The X-ray structure solved for the N2S2 porphyrin with four meso-thienyl groups showed supramolecular assembly formation in the solid state due to C−H···N hydrogen
Core-Modified Analogues of Expanded Porphyrins Containing Rigid β,β′-Linked<i>o</i>-Phenylene Bridges
作者:Vijayendra S. Shetti、Se-Young Kee、Chang-Hee Lee
DOI:10.1002/asia.201301320
日期:2014.3
ring other than pyrrole and rigidβ‐β′ linkages have not been well studied up to date. The rigidity caused by the conformational restriction would change the spectroscopic properties of the system as compared with those of the normal congeners. With these considerations, we have synthesized and fully characterized π‐extended, core modified expandedporphyrins bearing rigid bipyrrole units. Core‐modified
迄今为止,尚未对结构修饰导致包含除吡咯和刚性β-β'键以外的杂环的π-延伸的芳香族大环的形成进行研究。与常规同类物相比,由构象限制引起的刚性将改变系统的光谱性质。考虑到这些因素,我们合成并表征了带有刚性联吡咯单元的π扩展核修饰膨胀卟啉。通过路易斯酸催化的萘联吡咯与噻吩/呋喃二醇的缩合反应合成了核修饰的萘并呋喃酮,而萘并二萘嵌苯醚是通过在温和的反应条件下使2,9-二甲酰基-萘并吡咯与16-噻吩/草酰三吡喃反应制得的。萘鲁比林和萘草皮苷的核心修饰类似物均表现出芳香性。双硫杂菊酯类似物显示缺乏预期的构象变化,并且显示出良好的分辨能力室温下的1 H NMR共振。另一方面,草叶磷灰素类似物采用呋喃倒置的几何形状,并且环倒置与质子化状态无关。草酸萘并卟啉在613 nm处也显示出弱的荧光发射。
Core-modified porphyrins. Part 4: Steric effects on photophysical and biological properties in vitro
作者:Youngjae You、Scott L. Gibson、Russell Hilf、Tymish Y. Ohulchanskyy、Michael R. Detty
DOI:10.1016/j.bmc.2004.12.048
日期:2005.3
21,23-Dithiaporphyrins (2-10) were designed and prepared as analogues of 5,20-diphenyl-10,15-bis(4-carboxylatomethoxy)phenyl-21,23-dithiaporphyrin (1) to examine the impact of steric bulk at the 5- and 20-meso positions as well as the impact of symmetry. Changes at the meso positions had minimal impact on the UV-vis-near-IR absorption spectra, quantum yields for the generation of singlet oxygen, and quantum yields for fluorescence and some impact on values of the octanol/water partition coefficient. Of the compounds 1-10, 5-phenyl-20-(2-thienyl)-10,15-bis-(4-carboxylatomethoxy-phenyl)-21,23-dithiaporphyrin (3) showed the greatest phototoxicity toward cultured R3230AC cells, with 68% cell kill at 1 x 10(-7) M and irradiation with 5 J cm(-2) of 350-750 nm light. Results in this study suggest that smaller substituents on the meso ring and less symmetrical compounds are more effective as photosensitizers than compounds with two bulky substituents at adjoining meso sites and a higher symmetry. The mitochondria appear to be involved in the process of phototoxicity as determined by the inhibition of whole cell cytochrome c oxidase activity in cells treated with 3 and light. No impact upon mitochondrial cytochrome c oxidase activity was observed in cells treated with 3 and no light. Fluorescence microscopy studies suggest that the mitochondria are not initial sites of accumulation of 3. (c) 2004 Elsevier Ltd. All rights reserved.