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
作者:Hiroki Oguri
DOI:10.1055/s-1999-3646
日期:1999.8
Synthetic and Mechanistic Studies of the Retro-Claisen Rearrangement 4. An Application to the Total Synthesis of (+)-Laurenyne
作者:Robert K. Boeckman,、Jing Zhang、Michael R. Reeder
DOI:10.1021/ol0267174
日期:2002.10.1
[formula: see text] A novel asymmetric totalsynthesis of marine natural product (+)-Laurenyne has been achieved. The key elements of the strategy are the sequential metal ion-templated SN2' cyclization affording a highly functionalized chiral vinyl cyclobutane and a retro-Claisen rearrangement for the construction of an eight-membered ring ether.