Total synthesis of (+)-lysergic acid

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• Lysergic acid is a crucial ergot alkaloid with significant pharmacological importance.
• Previous syntheses of lysergic acid and its derivatives have faced challenges in stereocontrol and efficiency.

Purpose of the Study:

• To develop a novel, stereocontrolled total synthesis of (+)-lysergic acid.
• To showcase the utility of modern metal-catalyzed reactions in complex molecule synthesis.

Main Methods:

• Palladium-catalyzed indole synthesis for the B ring construction.
• Ring-closing metathesis (RCM) for the D ring formation.
• Intramolecular Heck reaction for the C ring assembly.

Main Results:

• Successful stereocontrolled total synthesis of (+)-lysergic acid achieved.
• Efficient construction of the three key rings (B, C, and D) using distinct metal-catalyzed methodologies.
• Demonstration of a convergent and efficient synthetic route.

Conclusions:

• The developed synthetic strategy provides a reliable and stereocontrolled access to (+)-lysergic acid.
• Metal-catalyzed reactions are powerful tools for constructing complex polycyclic systems.
• This synthesis offers a valuable platform for the preparation of lysergic acid analogs.