On the Origin of Siphonariid Polypropionates: Total Synthesis of Caloundrin B and Its Isomerization to Siphonarin B
作者:Fabiola Becerril-Jiménez、Dale E. Ward
DOI:10.1021/ol300432y
日期:2012.3.16
Enantioselective synthesis of the enantiomer of caloundrin B was achieved by strategic aldol coupling of an enantiopure trioxaadamantane-containing ketone with a racemic pyrone-containing aldehyde via kinetic resolution. In the presence of imidazole, ent-caloundrin B is cleanly isomerized to ent-siphonarin B confirming the proposed structure and absoluteconfiguration for caloundrin B and establishing