Vinylalumination for the Synthesis of Functionalized Allyl Alcohols, Vinylepoxides, and α-Alkylidene-β-hydroxy-γ-lactones

P. Veeraraghavan Ramachandran, Michael T. Rudd, Thomas E. Burghardt, M. Venkat Ram Reddy

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A modified hydroalumination protocol for the preparation of [α-(ethoxycarbonyl)vinyl]diisobutylaluminum and its β-methyl or -phenyl analogues was developed. These vinylaluminum reagents react with aldehydes and ketones to provide the corresponding functionalized allyl alcohols in good to excellent yields. Perfluoroalkyl and -aryl carbonyl compounds, α-keto esters, α-acyl cyanides, and α-acetylenic ketones provide the corresponding α-hydroxyalkenes in high yields. The allyl alcohol product ratios from the vinylalumination of unsymmetrical α-diketones with [α-(ethoxycarbonyl)-vinyl] diisobutylaluminum and its β-methyl or -phenyl analogues depend on the steric and electronic environments of the ketones as well as the reagents. The products from the vinylalumination of α-bromoaldehydes and -ketones were cyclized with K2CO3 or KF under nonaqueous conditions to provide functionalized vinylepoxides in high yields. Vinylaluminations of keto-protected pyruvaldehyde provided the products, which were converted to a-alkylidene-β-hydroxy-β-lactones.

Original languageEnglish (US)
Pages (from-to)9310-9316
Number of pages7
JournalJournal of Organic Chemistry
Issue number24
StatePublished - Nov 28 2003


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