Kisszékelyi P, Mudráková B, Cigáň M, Šebesta R. Persistent guaiazulene arylmethylium ions as electrophilic traps for metal enolates.
Chem Commun (Camb) 2024;
60:3339-3342. [PMID:
38440813 DOI:
10.1039/d4cc00208c]
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Abstract
Guaiazulene-stabilized cations reacted with metal enolates affording carbonyl compounds with an azulene moiety. Metal enolates generated by asymmetric conjugate addition of organometallic reagents led to enantioenriched products. Additionally, guaiazulene-substituted cations efficiently react with silyl enol ethers. DFT calculations allowed estimation of the electrophilicities of the carbocations. Reaction progress was monitored by a decrease in the reactant's Vis-light absorption and an increase in the product's anti-Kasha emission.
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