Mild and convenient N-formylation protocol in water-containing solvents

Area of Science:

• Medicinal Chemistry
• Organic Synthesis

Background:

• N-formylation of drug leads can enhance pharmacokinetic/pharmacodynamic (PK/PD) properties.
• Selective formylation of primary amines in polyfunctional molecules is challenging.
• Existing N-formylation methods for amino acids often yield unsatisfactory results.

Purpose of the Study:

• To develop a mild and convenient N-formylation reaction.
• To achieve selective formylation of primary amines in the presence of secondary amines.
• To improve the synthesis of N-formylated amino acids and drug leads.

Main Methods:

• Screening of N-formylation conditions using L-phenylalanine.
• Utilizing a water-soluble oxyma derivative (2), EDCI, and NaHCO3 in aqueous or DMF/water systems.
• Applying controlled temperatures for selective amine formylation.

Main Results:

• Developed a novel N-formylation method yielding N-formylated alpha-amino acids with excellent yields.
• Achieved selective formylation of primary amines over secondary amines.
• Demonstrated the method's utility by selectively formylating the antibiotic daptomycin.

Conclusions:

• The developed method offers a mild, efficient, and selective approach for N-formylation.
• This technique is valuable for modifying drug leads and complex molecules.
• The selective formylation of primary amines can improve drug PK/PD properties.