Remote proton elimination: C-H activation enabled by distal acidification.

Area of Science:

• Organic Chemistry
• Catalysis
• Reaction Mechanisms

Background:

• Acidity of C-H bonds is typically influenced by nearby functional groups.
• Activating C-H bonds at a distance presents a significant synthetic challenge.

Purpose of the Study:

• To develop a novel method for carbon-carbon sigma bond formation via remote proton elimination.
• To establish a regioselective and stereoselective synthesis of decalin derivatives.
• To investigate the reaction mechanism using computational studies.

Main Methods:

• Utilized remote proton elimination for C-H activation.
• Applied the method to cyclodecyl cations for decalin synthesis.
• Employed computational chemistry to elucidate the reaction pathway.
• Investigated stereoisomeric enrichment via hydrogen atom transfer.

Main Results:

• Demonstrated C-H activation five carbon-carbon bonds away.
• Achieved regioconvergent synthesis of decalins without directing groups or precious metals.
• Exhibited exquisite site selectivity in the transformation.
• Successfully controlled decalin stereochemistry through epimerization.

Conclusions:

• Remote proton elimination offers a unique strategy for C-H activation and C-C bond formation.
• This approach provides an efficient and selective route to complex decalin structures.
• The methodology is metal-free and avoids the need for directing groups, enhancing its synthetic utility.