10.1016/S0040-4039(97)00856-3
The study reports the first total synthesis of the natural product (+)-4-deoxygigantecin (1), a non-adjacent bis-tetrahydrofuran type annonaceous acetogenin. The synthesis began with enantiomerically pure (-)-muricatacin (3), which was converted through a series of reactions into key intermediate 5. This intermediate was then transformed into the final product via the formation of a bis-tetrahydrofuran unit 11 and a coupling reaction with iodo lactone synthon 16. The study highlights the use of various reagents and conditions, such as MOM ether for protection, n-BuLi for alkylation, Na in liquid ammonia for reduction, and the Sharpless asymmetric dihydroxylation for selective hydroxylation. The final product was obtained in 95% overall yield and its properties were consistent with those of the natural compound, demonstrating the successful synthesis of a complex natural product with significant biological activities.
10.1016/S0957-4166(01)00251-8
Muricatacin is a bioactive hydroxy lactone compound that is isolated from the plant Annona muricata. It is mentioned in the research as a compound with physiological activity. The study focuses on the synthesis of aza-muricatacin, a non-natural aza-analogue of muricatacin, which also exhibits interesting cytotoxic activity. The research aims to synthesize different diastereoisomers of aza-muricatacin, specifically the (5S,6S)- and (5S,6R)-isomers, starting from a common precursor derived from L-glutamic acid.