Synthetic studies towards cryptolaevilactone M from d-glucose

Area of Science:

• Organic Chemistry
• Natural Product Synthesis

Background:

• Cryptolaevilactone M is a bioactive natural product.
• Efficient synthetic routes to complex lactones are valuable.

Purpose of the Study:

• To develop a synthetic strategy for cryptolaevilactone M from D-(+)-glucose.
• To establish a versatile route for related δ-lactones.

Main Methods:

• Ten-step synthesis starting with C-3 PMB protected d-glucose diacetonide.
• Diastereoselective indium-mediated allylation and Grubbs II-catalyzed ring-closing metathesis.
• Selective anomeric oxidation and Grignard addition to construct the core framework.

Main Results:

• Successful construction of the α,β-unsaturated δ-lactone core.
• High yields achieved in key steps like allylation (94%) and ring-closing metathesis (92%).
• Introduction of the phenyl 1-butene side chain via Grignard addition, establishing the core framework.

Conclusions:

• The developed synthetic strategy provides efficient access to cryptolaevilactone M.
• The route is versatile for synthesizing related bioactive δ-lactones.
• Further steps are underway to complete the synthesis of cryptolaevilactone M.