Total Synthesis of Biselyngbyaside.

The first total synthesis of biselyngbyaside, an 18-membered macrolide glycoside, was achieved. The glycoside bond was introduced using the Schmidt method before construction of the 18-membered ring due to the instability of the conjugated diene and the ß-hydroxy ester moiety. The macrolactone ring was constructed using the Mitsunobu reaction followed by intramolecular the Stille coupling reaction.

Total Synthesis of Biselyngbyolide B.

The first total synthesis of biselyngbyolide B, an 18-membered macrolide, was achieved. The 18-membered ring structure was constructed by esterification using the Shiina reagent and an intramolecular Stille coupling reaction.

Total synthesis of biselyngbyolide A.

Biselyngbyolide A is an 18-membered macrolide that exhibits significant biological activities such as growth-inhibitory activity and apoptosis inducing activity against cancer cells. In this study, the first total synthesis of biselyngbyolide A by using an intramolecular Stille coupling reaction as a key step is achieved.