Co-MHAT-Catalyzed Wacker-Type Oxidation of 1,3-Enynes into Ynones

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• 1,3-enynes are versatile precursors for synthesizing valuable organic molecules.
• Difunctionalization of 1,3-enynes via radical processes is well-established.
• Hydrofunctionalization of 1,3-enynes remains less explored.

Purpose of the Study:

• To develop a novel method for the hydrofunctionalization of 1,3-enynes.
• To achieve Markovnikov regioselectivity in the Wacker-type oxidation of 1,3-enynes.
• To synthesize valuable conjugated ynones from readily available starting materials.

Main Methods:

• Reductive Cobalt-Metal-Hydride-Atom-Transfer (Co-MHAT) catalysis.
• Wacker-type oxidation of 1,3-enynes.
• Reaction conducted under air conditions.

Main Results:

• The first example of reductive Co-MHAT-catalyzed Wacker-type oxidation of 1,3-enynes is reported.
• Markovnikov regioselectivity was achieved, yielding conjugated ynones.
• The method demonstrated broad substrate scope and good functional group compatibility.

Conclusions:

• This novel Wacker-type oxidation provides a practical and efficient route to conjugated ynones.
• The reaction proceeds under mild conditions with simple operation.
• The method is suitable for late-stage modifications and diverse downstream transformations.