Sc(OTf)₃-catalyzed [3 + 2]-cycloaddition of nitrones with ynones.

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Catalysis

Background:

• Accessing functionalized heterocyclic compounds is crucial in synthetic chemistry.
• Isoxazoline derivatives are important scaffolds in medicinal chemistry and materials science.
• Developing efficient and one-pot synthetic methodologies is a key goal in modern organic synthesis.

Purpose of the Study:

• To develop an efficient one-pot synthetic strategy for functionalized (2,3-dihydroisoxazol-4-yl) ketones.
• To explore the utility of Sc(OTf)3-catalyzed [3 + 2]-cycloaddition reactions for this purpose.
• To synthesize a diverse library of novel (2,3-dihydroisoxazol-4-yl) ketone derivatives.

Main Methods:

• A one-pot reaction between nitrones and ynones (or terminal ynones).
• Utilized scandium triflate (Sc(OTf)3) as a catalyst for a formal [3 + 2]-cycloaddition.
• Characterization of the synthesized functionalized (2,3-dihydroisoxazol-4-yl) ketones.

Main Results:

• Successfully developed an efficient one-pot approach to synthesize functionalized (2,3-dihydroisoxazol-4-yl) ketones.
• The reaction proceeds via a Sc(OTf)3-catalyzed formal [3 + 2]-cycloaddition pathway.
• A range of functionalized (2,3-dihydroisoxazol-4-yl) ketones were obtained in moderate to good yields.

Conclusions:

• The developed method provides an efficient and practical route to valuable (2,3-dihydroisoxazol-4-yl) ketone derivatives.
• The one-pot strategy simplifies the synthetic process and enhances accessibility.
• This methodology holds potential for the synthesis of diverse heterocyclic compounds for further applications.