Pyrroles and related compounds. Part XXX. Cyclisation of porphyrin β-keto-esters to phaeoporphyrins
- 1 January 1974
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- Vol. 4, 527-530
- https://doi.org/10.1039/p19740000527
Abstract
Porphyrin β-keto-esters are cyclised to the corresponding phaeoporphyrins in high yield by treatment of the former with 2 equiv. of thallium(III) trifluoroacetate, followed by photolysis and demetallation. In this way, the first formal total syntheses of phaeoporphyrin-a5 dimethyl ester (6a) and 2-vinylphaeoporphyrin-a5 dimethyl ester (6b) have been accomplished.Keywords
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