(+)-Indolmycenic ester 4, a key intermediate for the synthesis of (-)-indolmycin (1), was prepared from (2S, 3R)-epoxybutyrate 5 via (2S, 3S)-2-hydroxy-3-chlorobutyrate 6 or (2R, 3R)-2-mesyloxy-3-hydroxybutyrate 12, which were obtained by lipase-catalyzed kinefic resolution of the corresponding 2-acetates.
Synthesis of (+)-Hypoxylactone through Allenoate γ-Addition: Revision of Stereochemistry
作者:Gyungah Pak、Euijin Park、Saehansaem Park、Jimin Kim
DOI:10.1021/acs.joc.0c02194
日期:2020.11.6
A synthesis of (+)-hypoxylactone has been accomplished in four steps starting from the allenoate γ-addition of threo-3-chloro-2-silyoxybutanals, leading to the revision of stereochemistry. The key was the discovery of control elements required to matching/mismatching cases in the allenoate γ-addition to provide the desired adducts as a single isomer. The utility of the γ-adduct was demonstrated with