Total syntheses of the four isomeric N-methylprotoporphyrin IX dimethyl esters have been achieved by the MacDonald and tripyrrene/a,c-biladiene routes using appropriate N-methylpyrroles and N-methyldipyrromethanes as intermediates. The syntheses of related N-methyl and N,N′-dimethylporphyrins have also been achieved by the MacDonald route.
R. K. Pandey, A. H. Jackson and K. M. Smith, J. Chem. Soc., Perkin Trans. 1, 1991, 1211 DOI: 10.1039/P19910001211
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