Site-switchable mono-O-allylation of polyols

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Chemistry

Background:

• Site-selective modification of complex molecules is crucial for synthesizing analogues and probing functions.
• Selectively targeting specific functional groups within a molecule, especially identical ones like hydroxyls, remains a significant challenge.
• Developing methods where reaction conditions can switch the site of modification is highly desirable.

Purpose of the Study:

• To develop a catalytic system for site-selective and site-switchable mono-O-allylation of polyols.
• To enable the facile synthesis of diverse polyol derivatives.
• To create a versatile tool for modifying complex bioactive natural products.

Main Methods:

• Development of a palladium (Pd) and Lewis acid co-catalytic system.
• Utilizing Lewis acid additives to direct selectivity towards specific hydroxyl groups in polyols.
• Employing readily available reagents and catalysts for the O-allylation reaction.

Main Results:

• Achieved site-selective and site-switchable mono-O-allylation of polyols.
• Demonstrated the ability to switch the reaction site by altering Lewis acid additives.
• Showcased the system's broad scope and applicability to complex natural products.

Conclusions:

• The developed Pd/Lewis acid co-catalytic system offers a powerful approach for site-switchable functionalization of polyols.
• This method provides a versatile platform for the derivatization of complex molecules, including bioactive natural products.
• The findings open new avenues for the synthesis of molecular analogues and derivatives for functional investigation.