Solvent-controlled leaving-group selectivity in aromatic nucleophilic substitution

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Synthetic Chemistry

Background:

• Nucleophilic aromatic substitution (S_NAr) reactions are fundamental in organic synthesis.
• Controlling selectivity in S_NAr reactions with competing leaving groups remains a challenge.
• The xanthone core is a key structural motif in various bioactive compounds, including antibiotics.

Purpose of the Study:

• To develop a solvent-controlled strategy for selective S_NAr reactions.
• To demonstrate the application of this strategy in synthesizing the functionalized xanthone core of FD-594.
• To achieve selective formation of internal substitution products.

Main Methods:

• Investigating S_NAr reactions with substrates possessing multiple leaving groups.
• Utilizing solvent effects to modulate leaving group ability.
• Applying the developed methodology to the synthesis of the FD-594 antibiotic core.

Main Results:

• Demonstrated a solvent-controlled inversion of leaving group ability in S_NAr reactions.
• Achieved selective access to specific internal substitution products.
• Successfully synthesized the highly functionalized xanthone core of FD-594.

Conclusions:

• The developed method offers a powerful tool for selective synthesis in organic chemistry.
• Solvent control provides a viable strategy for manipulating reactivity in S_NAr reactions.
• This approach facilitates the efficient synthesis of complex pharmaceutical intermediates like the FD-594 xanthone core.