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Creators/Authors contains: "Silberberg, Natalie A"

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  1. ; ; (, Organic Letters)
    Baeyer-Villiger oxidation of alpha-alkoxy ketones 1 provides lactone acetals 2, which react with the lithium salts of di-methyl(alkyl) phosphonates in the presence of LaCl3•2LiCl to provide cyclic enones 3 in good to excellent yields after treatment with dilute aqueous potassium carbonate. Thus, five-, six-, and seven-membered lactones are con-verted to five-, six-, and seven membered cyclic enones. The utility of this two-step ring expansion method is demonstrated in the synthesis of (±)-1-epi-xerantholide from 5-methyl-2-cyclohexen-1-one. 
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