Total synthesis of (-)-4-hydroxyzinowol

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Synthetic Chemistry

Background:

• P-glycoprotein is implicated in multi-drug resistance (MDR) in cancer treatment.
• (-)-4-Hydroxyzinowol is a potent inhibitor of P-glycoprotein.
• The complex structure of (-)-4-Hydroxyzinowol presents a significant synthetic challenge.

Purpose of the Study:

• To achieve the total synthesis of (-)-4-Hydroxyzinowol.
• To develop efficient chemo- and stereoselective reactions for constructing complex natural products.

Main Methods:

• Total synthesis in 36 steps from 5-acetoxynaphthalen-1-ol.
• Rhodium-catalyzed asymmetric 1,4-addition to set the C7-stereocenter.
• Stepwise construction of cis-oriented hydroxy groups on the B-ring.
• Oxidative dearomatization and Diels-Alder reaction for AB-ring construction.
• Acid-promoted C-ring ether formation.
• Stereoselective installation of oxygen-based functional groups.
• Regioselective acetylation and benzoylation for final product formation.

Main Results:

• Successful total synthesis of (-)-4-Hydroxyzinowol, a complex polyoxygenated natural product.
• Establishment of nine consecutive stereocenters on the decalin skeleton.
• Demonstration of powerful chemo- and stereoselective reactions in a complex synthesis.
• Synthesis of a potent P-glycoprotein inhibitor.

Conclusions:

• The total synthesis of (-)-4-Hydroxyzinowol was achieved, showcasing advanced synthetic strategies.
• The synthetic route effectively addressed the challenge of constructing multiple stereocenters.
• The synthesized compound holds potential for overcoming multi-drug resistance in cancer therapy.