Metal-mediated cross-coupling methodologies have been successfully employed to porphyrinic systems, providing a powerful, versatile, and general synthetic approach for the fabrication of elaborated porphyrin structures. A large number of coupling reactions have been carried out at two halogenated porphyrin templates, [2-bromo-5,10,15,20-tetraphenylporphinato]zinc and [5,15-dibromo-10,20-diphenylporphinato]zinc, generating a variety of porphyrins, 10 of which are novel: [2-n-butyl-5,-10,15,20-tetraphenylporphinato]zinc(II), [2-(2,5-dimethoxyphenyl)-5,10,15,20-tetraphenylporphinato]-zmc(II),[2-(9-anthracenyl)-5,10,15,20-tetraphenylporphinato]zinc(II), [2-vinyl-5,10,15,20-tetraphenylporphinato]zinc(II), [2,5,10,15,20-pentaphenylporphinato]zinc(II), [2-isobutyl-5,10,15,20-tetraphenylporphinato]zinc(II), [2-(pentafluorophenyl)-5,10,15,20-tetraphenylporphinato]zinc(II), [5,15-bis-[[2-(4′-methyl-2′-pyridyl)-4-pyridyl]methyl]-10,20-diphenylporphinato]zinc(II), [5,15-divmyl-10,20-diphenylporphinato]zinc(II), [5,15-bis(2,5-dimethoxyphenyl)-10,20-diphenylporphinato]zinc(II), and [5,15-bis(pentafluorophenyl)-10,20-diphenylporphinato]zinc(II). The structures of [2,5,10,15,20-pentaphenylporphinato]zinc(II) and 5,15-bis-(pentafluorophenyl)-10,20-diphenylporphyrin have been determined; X-ray data are as follows: P21/n with a = 21.425(4) Å, b = 9.718(1) Å, c = 24.905(2) Å, β = 110.83(1)°, V = 4846(3) Å3, dcalc = 1.260 g cm−3, and Z = 4 for the former; and P21/c with a = 15.223(2) Å, b = 10.162(1) Å, c = 12.375(2) Å, β = 112.75(2)°, V= 1765.6(9) Å3, dcalc = 1.495 g cm−3, and Z = 2 for thelatter. This study demonstrates that cross-coupling reactions at the porphyrin periphery are seemingly not subject to the steric or electronic constraints that often limit the scope of these reactions in simple aryl and vinyl systems.
ASJC Scopus subject areas
- Organic Chemistry