Csp³-H Bond Carbynoid Functionalization by Photoredox Catalysis

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• 1,3-dicarbonyl compounds are versatile building blocks in organic synthesis.
• Developing efficient methods for functionalizing Csp3-H bonds is crucial for accessing complex molecules.
• Photoredox catalysis has emerged as a powerful tool for novel chemical transformations.

Purpose of the Study:

• To develop a novel photoredox-catalyzed Csp3-H carbynoid functionalization of 1,3-dicarbonyl compounds.
• To establish a direct route for the synthesis of α,β-diacyl-α,β-unsaturated ketones.
• To explore the application of this methodology for accessing β-deuterated carbonyl compounds.

Main Methods:

• Utilizing photoredox catalysis to activate α-iodionium diazo compounds.
• Employing 1,3-dicarbonyl compounds as substrates for Csp3-H functionalization.
• Investigating a 1,2-H shift mechanism for deuterium incorporation.

Main Results:

• Successful development of a photoredox-catalyzed Csp3-H carbynoid functionalization.
• Rapid assembly of α,β-diacyl-α,β-unsaturated ketones achieved.
• Demonstrated straightforward access to β-deuterated-α,β-unsaturated carbonyl molecules.

Conclusions:

• The developed protocol provides an efficient and direct method for synthesizing valuable unsaturated ketone derivatives.
• This work expands the scope of photoredox catalysis in C-H functionalization.
• The protocol offers a unique pathway for isotopic labeling in carbonyl compounds.