Total synthesis of (-)-laulimalide

Area of Science:

• Marine natural products chemistry
• Organic synthesis
• Chemical biology

Background:

• (-)-Laulimalide is a novel macrolide from marine sponges.
• It exhibits potent anticancer activity by promoting abnormal tubulin polymerization and apoptosis.
• Its mode of action is similar to Taxol(R), with potential advantages in overcoming multidrug resistance.

Purpose of the Study:

• To develop a flexible and convergent asymmetric synthesis of (-)-laulimalide.
• To establish an efficient route for producing laulimalide and its analogues for further research.

Main Methods:

• The synthesis employed a diastereoselective Sakurai reaction.
• A regioselective macrolactonization of an unprotected vicinal diol was a key step.
• The overall synthesis involved 25 steps (longest linear) and 36 steps overall.

Main Results:

• (-)-Laulimalide was successfully synthesized.
• The synthesis achieved a 3.5% overall yield.
• The route is notably short and efficient, facilitating analogue synthesis.

Conclusions:

• A novel and efficient asymmetric synthesis of (-)-laulimalide has been established.
• This synthetic route provides access to laulimalide and its analogues, crucial for exploring their therapeutic potential.
• The synthesis highlights key reactions like the Sakurai reaction and macrolactonization for complex molecule construction.