α-Halocarbonyls as a Valuable Functionalized Tertiary Alkyl Source

Area of Science:

• Synthetic Organic Chemistry
• Radical Chemistry
• Organometallic Chemistry

Background:

• α-Bromocarbonyl compounds with tertiary carbons were historically limited to radical initiator roles in atom transfer radical polymerization (ATRP).
• The advent of photo-radical reactions around 2010 spurred interest in these compounds as tertiary alkyl radical precursors.
• Emerging research revealed broader reactivity beyond radical chemistry.

Purpose of the Study:

• To review the diverse synthetic organic chemical value of α-bromocarbonyl compounds featuring tertiary carbons.
• To highlight their expanded applications in various reaction types beyond radical initiation.
• To showcase their utility in modern organic synthesis and total synthesis strategies.

Main Methods:

• Comprehensive literature survey of α-bromocarbonyl compound reactivity up to 2022.
• Analysis of their roles as radical precursors, nucleophiles, electrophiles, and in organometallic/ionic reactions.
• Examination of their application in diverse synthetic transformations including multi-component reactions, cross-coupling, and cyclizations.

Main Results:

• α-Bromocarbonyl compounds with tertiary carbons exhibit dual nucleophilic and electrophilic character.
• They serve as versatile precursors for tertiary alkylation, a previously challenging transformation.
• Their application spans a wide array of organic reactions, including stereospecific and asymmetric synthesis.

Conclusions:

• α-Bromocarbonyl compounds are indispensable tools in contemporary organic synthesis, offering broad reactivity.
• Their unique properties facilitate complex molecular assembly and total synthesis.
• These compounds have significantly advanced the field of tertiary alkylation, opening new synthetic avenues.