Borylation of Aryl Halides Induced by Visible Light Under Open-To-Air Environment

Area of Science:

• Organic Chemistry
• Sustainable Synthesis
• Photochemistry

Background:

• Aryl boronate esters are crucial building blocks in organic synthesis, particularly for creating bioactive molecules.
• Developing novel and sustainable methods for their synthesis remains an active area of research.

Purpose of the Study:

• To establish a new, environmentally friendly methodology for aryl boronate ester synthesis.
• To utilize visible light and organic confined media, avoiding photocatalysts and harsh conditions.

Main Methods:

• Employing visible light as the sole energy source.
• Utilizing a purely organic gel network as a confined reaction medium.
• Investigating the borylation of various aryl halides under open-to-air conditions.

Main Results:

• Successful synthesis of aryl boronate esters from diverse aryl halides with various functional groups.
• Achieved quantitative product yields in several instances.
• Identified the formation of a ground-state complex stabilized by hydrogen bonding through spectroscopic and computational analyses.

Conclusions:

• The developed methodology provides a sustainable and efficient route to aryl boronate esters.
• The organic gel network facilitates substrate scope and reaction efficiency.
• Mechanistic studies elucidated the role of complex formation and photoreactivity.