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- Title
Total Synthesis of Phorbazole B.
- Authors
Guttormsen, Yngve; Fairhurst, Magnus E.; Pandey, Sunil K.; Isaksson, Johan; Haug, Bengt Erik; Bayer, Annette; Sydnes, Magne Olav; Harvey, Joanne
- Abstract
Phorbazoles are polychlorinated heterocyclic secondary metabolites isolated from a marine sponge and several of these natural products have shown inhibitory activity against cancer cells. In this work, a synthesis of the trichlorinated phorbazole B using late stage electrophilic chlorination was developed. The synthesis relied on the use of an oxazole precursor, which was protected with an iodine in the reactive 4-position, followed by complete chlorination of all pyrrole positions. Attempts to prepare phorbazole A and C, which contain a 3,4-dichlorinated pyrrole, were unsuccessful as the desired chlorination pattern on the pyrrole could not be obtained. The identities of the dichlorinated intermediates and products were determined using NMR techniques including NOESY/ROESY, 1,1-ADEQUATE and high-resolution CLIP-HSQMBC.
- Subjects
INTERMEDIATE goods; METABOLITES; SPONGES (Invertebrates); PYRROLES; NATURAL products; POLYPYRROLE
- Publication
Molecules, 2020, Vol 25, Issue 20, p4848
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules25204848