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Brégier F, Godard J, Thiais J, Bouramtane S, Moulin A, Champavier Y, Mailleau A, Chaleix V, Sol V. Regioselective reduction of 5-aryl-10,15,20-tris(pyridyl) porphyrin to 5-aryl-10,15,20-tris(pyridyl)dihydroporphyrin (chlorin). J PORPHYR PHTHALOCYA 2020. [DOI: 10.1142/s1088424619501438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Dihydroporphyrins or chlorins differ from porphyrins only by saturation of a peripheral double bond of the macrocycle. However, this small structural difference leads to a significant increase of the absorption band at approximately 650 nm, which makes them very interesting candidates for photodynamic therapy applications. The reduction of porphyrins bearing two, three or four pyridyl substituents with tin(II) chloride has been developed for the synthesis of dihydroporphyrins in yields of 15–73%. The reduction of 5-(aryl)-10,15,20-tris(2 or 4-pyridyl)porphyrin with tin(II) chloride dihydrate demonstrated good regioselectivity. Porphyrins with one meso-aryl bearing one electron-donating group (EDG) gave 5-aryl-10,15,20-tris(2- or 4-pyridyl)-17,18-dihydroporphyrins in 17–72% yield. Porphyrins with one meso-aryl bearing one or more electron-withdrawing groups (EWG) gave 5-aryl-10,15,20-tris(4-pyridyl)-17,18-dihydroporphyrins or 5-aryl-10,15,20-tris(4-pyridyl)-7,8-dihydroporphyrins in 15–21% yield and isobacteriochlorin. We have also proven the possibility of functionalizing these compounds to design new regioisomerically pure photosensitizers.
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Affiliation(s)
- Frédérique Brégier
- Université de Limoges, PEIRENE, EA 7500, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France
| | - Jérémy Godard
- Université de Limoges, PEIRENE, EA 7500, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France
| | - Jordan Thiais
- Université de Limoges, PEIRENE, EA 7500, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France
| | - Soukaina Bouramtane
- Université de Limoges, PEIRENE, EA 7500, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France
| | - Alexia Moulin
- Université de Limoges, PEIRENE, EA 7500, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France
| | - Yves Champavier
- BISCEm, FR3503 GEIST, Centre de Biologie et de Recherche en Santé (CBRS), 2 rue du Dr Marcland, 87025 Limoges Cedex, France
| | - Alexis Mailleau
- BISCEm, FR3503 GEIST, Centre de Biologie et de Recherche en Santé (CBRS), 2 rue du Dr Marcland, 87025 Limoges Cedex, France
| | - Vincent Chaleix
- Université de Limoges, PEIRENE, EA 7500, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France
| | - Vincent Sol
- Université de Limoges, PEIRENE, EA 7500, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France
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