On the Novel Free Porphyrins Corallistin B, C, D, and E: Isolation from the demosponge Corallistes sp. of the Coral Sea and Reactivity of Their Nickel 55 (II) Complexes toward Formylating Reagents
✍ Scribed by Michele D'Ambrosio; Antonio Guerriero; Francesco Pietra; Cécile Debitus; Olivier Ribes
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- German
- Weight
- 515 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Reported here are the novel free porphyrins corallistin B, C, D, and E, isolated as methyl esters 2a, 3a, 4a, and 5a, respectively, from the sponge Cordistes sp. (Lithistida) collected at the basis of the south New Caledonian coral reef. A protocol is also established for formylation of their Ni" complexes, which show a different reactivity pattern toward DMF/POCl, from metal complexes of deuteroporphyrins. Together with corallistin A, previously isolated as the methyl ester la, and the known deuteroporphyrin IX (isolated as 6a) also present in the sponge, the new corallistins, which may be thought to derive from protoporphyrin oiu heme, account for an amazing 60% of the EtOH extract from the sponge.