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DOI: 10.1055/s-2006-939682
Synthesis of 4-Nitrophenyl Sulfones and Application in the Modified Julia Olefination
Publication History
Publication Date:
05 May 2006 (online)
Abstract
4-Nitrophenyl (NP) sulfones have been successfully employed in the modified Julia olefination reaction with carbonyl compounds. The olefination reaction proceeds through a sequence of aldol addition, Smiles rearrangement, and elimination. The sulfones are easily prepared in high yields in a two-step sequence starting from inexpensive commercially available para-fluoronitrobenzenes via nucleophilic aromatic substitution by a mercaptane and subsequent oxidation under standard conditions. The modified Julia reaction between NP sulfones and a wide variety of aromatic aldehydes affords the corresponding styrenes, stilbenes and cinnamate derivatives in yields up to 97% and good stereoselectivities. A mechanistic rationale is advanced to explain the observed results.
Key words
alkene - 4-nitrophenyl sulfone - nucleophilic aromatic substitution - olefination - Smiles rearrangement
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References and Notes
Yields and E/Z ratios of the modified Julia olefination with NP sulfones using KHMDS as base after flash chromatography for 2ba: 14% (97:3), 2bb: 55% (>99:1), 2bd: 33% (96:4), 2bg: 58% (95:5), 2ca: 23% (88:12), 2cb: 48% (52:48), 2cd: 32% (94:6), 2cg: 73% (59:41).