Autoxidation of Heterocyclic Aminals.

Area of Science:

• Organic Chemistry
• Reaction Mechanisms
• Heterocyclic Chemistry

Background:

• Autoxidation is a key process in organic chemistry.
• Understanding radical reactions is crucial for synthesis.
• Dihydroquinazolinones are an important class of heterocyclic compounds.

Purpose of the Study:

• To investigate the autoxidation reactions of specific dihydroquinazolinone derivatives.
• To elucidate the reaction mechanisms involving aminyl and carbon-based radicals.
• To explore the formation of diverse products with controlled selectivity.

Main Methods:

• Studying the autoxidation of 2-acyl-2,3-dihydroquinazolin-4(1H)-ones (4a, 5a) and 2,2'-bis(dihydroquinazolinone) (6a).
• Analyzing the generation and subsequent reactions of aminyl and carbon-based radicals.
• Characterizing the diverse products formed under varying substrate structures.

Main Results:

• Autoxidation generates aminyl radicals that undergo beta-C-C cleavage.
• Subsequent reactions with O2 lead to selective formation of diverse products.
• Specific substrates yielded heterocyclic C-hydroperoxylaminals, peracetic acid, or bis(quinazolinone) products.

Conclusions:

• The autoxidation of dihydroquinazolinones proceeds via radical intermediates.
• Product selectivity is highly dependent on the substrate's structural features.
• These reactions offer a pathway to novel heterocyclic compounds and functionalized molecules.