Synthesis and absolute configuration of polypropionate metabolites of siphonaria australis
作者:Uma N. Sundram、Kim F. Albizati
DOI:10.1016/s0040-4039(00)93961-3
日期:1992.1
An enantioselective synthesis of a C17 metabolite from Siphonaria australis has been accomplished. This has led to the assignment of the absoluteconfiguration of two metabolites in this series through the use of the exciton chirality method.
Reported herein is the total synthesis of zincophorin methylester, a polyketide ionophore. Of particular interest is the use of sterically hindered nucleophiles to surmount the unfavorable stereochemical outcome, leading to acetate aldol adducts, in nucleophilic addition to the aldehyde derived from propionates. The approach is based on the addition of an enoxysilane (bearing a removable phenylselenide