Direct Aromatic Nitrosation Using 2-Methoxyethyl Nitrite as a NO Cation Source

Area of Science:

• Organic Chemistry
• Synthetic Chemistry

Background:

• Aromatic electrophilic substitution is a fundamental reaction in organic synthesis.
• Traditional nitrosation methods often require harsh acidic conditions, limiting substrate scope.
• Existing protocols struggle with acid-sensitive compounds and can lead to undesired nitration.

Purpose of the Study:

• To develop a novel, acid-free method for aromatic nitrosation.
• To utilize 2-methoxyethyl nitrite (MOE-ONO) as a versatile reagent for electrophilic nitrosation.
• To enable the nitrosation of acid-sensitive substrates and pronucleophiles.

Main Methods:

• Employing 2-methoxyethyl nitrite (MOE-ONO) as both a NO radical and NO cation source.
• Investigating the electrophilic nitrosation of phenols, naphthols, and other pronucleophiles.
• Optimizing reaction conditions to suppress side reactions like nitration.

Main Results:

• Successful acid-free aromatic electrophilic nitrosation was achieved using MOE-ONO.
• The method effectively nitrosated phenols, naphthols, and other pronucleophiles.
• Undesired nitration by NO radicals was completely suppressed, and acid-sensitive substrates were nitrosated.

Conclusions:

• 2-methoxyethyl nitrite (MOE-ONO) is a valuable reagent for aromatic electrophilic nitrosation.
• This acid-free protocol offers a milder and more versatile alternative to existing methods.
• The developed method expands the synthetic utility of nitrosation for acid-labile compounds.