The absolute stereochemistry of the secondary alcohol of the 1,2-dihydroxybutenyl substituent of ciguatoxin (1) was shown to be S by comparing the split CD curve of ciguatoxin tetra-p-bromobenzoate (2) with those of di- and tri-p-bromobenzoates of AB ring fragments that were synthesized enantioselectively.
The strategy and synthetic efforts leading to efficient stereoselective syntheses of thiangazole, a tris-thiazolinyl-oxazole metabolite isolated from Poly-angium spp., and of hydantocidin, a spironucleoside metabolite isolated from Streptomyces hygroscopicus, are discussed.
Designed Hapten Aimed at Anti-ciguatoxin Monoclonal Antibody: Synthesis, Immunization and Discrimination of the C2 Configuration