A Modular Approach to Trisubstituted Chiral Piperidines

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• Chiral piperidines are crucial scaffolds in pharmaceuticals.
• Existing synthetic methods often lack scalability or stereocontrol.

Purpose of the Study:

• To develop a modular and scalable strategy for synthesizing trisubstituted chiral piperidines.
• To enable diverse functionalization of piperidine intermediates.

Main Methods:

• Scalable chiral-pool synthesis of a piperidine tricarboxylic acid diester via formal 4 + 2 cyclization.
• Diastereoselective reduction, cyclic anhydride formation, and regioselective ring-opening.
• Sequential decarboxylative functionalizations using transition metal catalysis and photocatalysis.

Main Results:

• Successful synthesis of a key piperidine tricarboxylate intermediate on a >50 g scale.
• Preparation of highly elaborated chiral piperidines and pipecolic esters.
• Demonstrated chemo- and stereoselective functionalization of the piperidine core.

Conclusions:

• The reported modular strategy provides efficient access to complex chiral piperidines.
• This approach offers a versatile platform for drug discovery and development.
• The method ensures high enantio- and diastereoselectivity in the final products.