Diastereoselectively Complementary C-H Functionalization Enables Access to Structurally and Stereochemically Diverse...

Area of Science:

• Organic Chemistry
• Synthetic Methodology
• Heterocyclic Chemistry

Background:

• Piperidine derivatives are crucial scaffolds in pharmaceuticals and natural products.
• Diastereoselective synthesis of 2,6-substituted piperidines is challenging.
• Existing methods often lack efficiency or broad substrate scope.

Purpose of the Study:

• To develop a novel, diastereoselective C-H functionalization protocol for piperidine synthesis.
• To achieve stereochemically complementary access to cis- and trans-2,6-substituted piperidines.
• To demonstrate the utility of the method in synthesizing complex molecules.

Main Methods:

• Oxidative C-H functionalization of N-carbamoyl tetrahydropyridines.
• Utilized a variety of building blocks for diverse functionalization.
• Employed a metal-free reaction system.

Main Results:

• Achieved high regio- and diastereoselectivities for both cis- and trans-isomers.
• Demonstrated excellent functional group tolerance.
• Successfully applied the method to natural product and analogue synthesis.

Conclusions:

• The developed method provides an efficient and versatile route to substituted piperidines.
• The metal-free, diastereoselective C-H functionalization overcomes synthetic challenges.
• This protocol expands synthetic possibilities in medicinal and natural product chemistry.