Porphyrins with exocyclic rings. Part 21: Influence of pyrrolic and carbocyclic ring alkyl substituents on the synthesis of porphyrins bearing six-membered exocyclic rings
作者:Craig M. Shiner、Timothy D. Lash
DOI:10.1016/j.tet.2005.10.019
日期:2005.12
cyclohexanones with phenylhydrazones derived fromesters of acetoacetic acid under Knorr-type reaction conditions. Related 6,6-dimethyltetrahydroindoles were also prepared by reacting dimedone with oximes by the Knorr pyrrole syntheses, followed by selective reduction of the remaining ketone moiety with diborane. The substituted tetrahydroindoles were regioselectively oxidized with lead tetraacetate to give
A new porphyrin derivative for use as a diene in the Diels-Alder reaction
作者:Paul A. Liddell、Lori J. Demanche、Shumin Li、Alisdair N. Macpherson、Ronald A. Nieman、Ana L. Moore、Thomas A. Moore、Devens Gust
DOI:10.1016/s0040-4039(00)79948-5
日期:1994.2
The first representative of a new class of porphyrins featuring a tetramethine bridge joining the 2 and 20 positions of the macrocycle has been prepared and found to undergo the Diels-Alderreaction, yielding structures in which functional groups are linked to the porphyrin macrocycle through a rigid, bicyclic bridge.
Porphyrins with exocyclic rings. Part 23: Synthesis of porphyrins with large exocyclic rings—cyclohexadeca[b]pyrroles and porphyrins therefrom
作者:Timothy D. Lash、Thomas G. Marron、Jolie A. Bastian
DOI:10.1016/j.tet.2007.09.060
日期:2007.12
gave the corresponding large ring cycloalka[b]pyrroles in excellent yields. A cyclohexadeca[b]pyrrole was reacted with lead tetraacetate to give an acetate derivative, and this condensed with α-unsubstituted pyrroles in the presence of p-toluenesulfonic acid in acetic acid to give a series of related dipyrrolic structures. Hydrogenolysis of the benzyl ester protective groups, followed by ‘2+2’ condensations
The Rational Synthesis of Chlorins via Rearrangement of Porphodimethenes: Influence of β-Substituents on the Regioselectivity and Stereoselectivity of Pyrroline Ring Formation
作者:Dennis H. Burns、Yue H. Li、Dong C. Shi、Timothy M. Caldwell
DOI:10.1021/jo020105f
日期:2002.6.1
density, with an electron-neutral hydrogen or an electron-withdrawing carbonyl beta-substituent demonstrating the greatest influence on the formation of the pyrrolinering. The synthesis is highly stereoselective when epimerization of the pyrrolinering beta-carbons is possible, furnishing only the trans-reduced sterioisomer. Finally, there is substantial evidence that a fifth, axial ligand is involved
The identification of deuteroetiohaem IX in colorado coal
作者:Raymond Bonnett、Stella Ioannou、David C. Moffat、Elena V. Shukina
DOI:10.1039/c39930001564
日期:——
Using paramagnetically-shifted 1H NMR spectroscopy of the dicyano-iron(III) complexes at 600 MHz as the principal tool, the identification of etiohaem III in Colorado coal is confirmed (1.63 µg g–1), and deuteroetiohaem IX (0.52 µg g–1) is identified for the first time, by comparison with samples made by total synthesis.