A formal synthesis of psymberin.

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Medicinal Chemistry

Background:

• Psymberin (irciniastatin A) is a complex marine natural product with a unique polycyclic structure.
• The biological activity and structural complexity of psymberin make it an attractive target for total synthesis.

Purpose of the Study:

• To achieve the first total synthesis of psymberin (irciniastatin A).
• To develop and showcase novel synthetic methodologies applicable to complex molecule construction.

Main Methods:

• Chemo-, regio-, and stereoselective oxidation of a 1,3-disubstituted allene.
• Configuration-dependent spirodiepoxide opening.
• Efficient synthesis of functionalized trans-2,6-disubstituted pyrans.
• Coupling of a functionalized aldehyde with a pentasubstituted aryl homoenolate.

Main Results:

• Successful completion of the first formal total synthesis of psymberin (irciniastatin A).
• Demonstration of key transformations including stereoselective allene oxidation and spirodiepoxide opening.
• Construction of the dihydroisocumarin core through a novel homoenolate addition.

Conclusions:

• The developed synthetic route provides a viable pathway to psymberin and related analogs.
• The synthetic strategies employed offer valuable tools for the construction of other complex natural products.
• This work expands the repertoire of synthetic organic chemistry for accessing challenging molecular architectures.