Syntheses of pemptoporphyrin, isopemptoporphyrin, and protoporphyrin IX dimethyl esters by cyclisation of the corresponding 1-bromo-1,19-dideoxy-19-methyl-biladiene-ac dihydrobromides, with use of the 2-(methoxycarbonylamino)ethyl groups as precursors of the peripheral vinyl substituents, are described.
R. Grigg, A. W. Johnson and M. Roche, J. Chem. Soc. C, 1970, 1928 DOI: 10.1039/J39700001928
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