A new synthetic approach to porphyrin-α-diones and a -2,3,12,13-tetraone: building blocks for laterally conjugated porphyrin arrays
作者:Vinich Promarak、Paul L. Burn
DOI:10.1039/b007389j
日期:——
We report the first use of the Dess–Martin periodinane (DMP) for the oxidation of an arylamine to an α-dione. The methodology is illustrated by the preparation of free-base and metal chelated porphyrin-α-diones in up to 52% yield by oxidation of 2-aminoporphyrins with the DMP. We also found that DMP could be used to oxidise a 2,3-diaminoporphyrin to a porphyrin-α-dione in good yield with other free-base
Bis-porphyrin arrays. Part 2.† The synthesis of asymmetrically substituted bis-porphyrins
作者:Richard Beavington、Paul L. Burn
DOI:10.1039/a907059a
日期:——
A strategy for the synthesis of asymmetrically substituted tetraazaanthracene linked bis-porphyrins in which the two porphyrin rings contain differences in their peripheral substituents has been developed. The method is illustrated by the preparation of bis-porphyrins with a single meso-halophenyl and seven meso-3,5-di-tert-butylphenyl substituents. The bis-porphyrins were prepared by condensation of a porphyrin-α-dione with benzene-1,2,4,5-tetraamine to form a porphyrin diaminoquinoxaline intermediate which was subsequently condensed with a second different porphyrin-α-dione. The key issue in the synthesis was the separation of the desired asymmetrically substituted bis-porphyrin from the symmetric bis-porphyrin by-products of similar polarities. Enhanced separation of the bis-porphyrin products was achieved by chelation of a metal into one of the porphyrin rings, the metal being introduced at the porphyrin-α-dione stage. Copper was successfully used when chelated into the less polar porphyrin-α-dione but the use of zinc in the more polar porphyrin-α-dione to enhance bis-porphyrin separation was unsuccessful as the pyridinium hydrochloride produced in the reaction was found to demetallate the porphyrins.
Construction of building blocks for extended porphyrin arrays by nitration of porphyrin-2,3-diones and quinoxalino[2,3-b]porphyrins
作者:Maxwell J. Crossley、Craig S. Sheehan、Tony Khoury、Jeffery R. Reimers、Paul J. Sintic
DOI:10.1039/b712643c
日期:——
difficult to separate, allows for highly selective remetalation of the 7-isomer and its very easy separation from the unmetalated 12-nitro-porphyrin-dione. These nitrated compounds are useful buildingblocks for more elaborate systems.
Fused porphyrin-imidazole systems: new building blocks for synthesis of porphyrin arrays
作者:Maxwell J. Crossley、James A. McDonald
DOI:10.1039/a905507j
日期:——
Reaction of porphyrin-2,3-diones with aromatic aldehydes and NH4OAc in AcOH–CHCl3 affords 2-aryl-1H-imidazo[4,5-b]porphyrins which, with appropriate substitution, are useful buildingblocks for the synthesis of multi-porphyrin arrays; porphyrin-tetraones are similarly converted into the corresponding bis-fused systems.
卟啉-2,3-二酮与芳香醛和NH 4 OAc在AcOH-CHCl 3中反应,得到2-芳基-1 H-咪唑并[4,5- b ]卟啉,经适当取代后,可作为有用的结构单元多卟啉阵列的合成;卟啉四酮同样被转化为相应的双稠合体系。
Beavington, Richard; Rees, Philip A.; Burn, Paul L., Journal of the Chemical Society. Perkin transactions I, 1998, # 17, p. 2847 - 2851
作者:Beavington, Richard、Rees, Philip A.、Burn, Paul L.