Bicyclic δ-lactones, iridolactones analogs with an alkyl group at the bicyclic junction, are obtained from α-alkyl-α-hydroxymethylcyclopentanones via an intramolecular Horner–Wadsworth–Emmons reaction.
Lipase-catalyzed kinetic resolution of α-hydroxymethylcycloalkanones with a quaternary carbon center. Chemoenzymatic synthesis of chiral pseudoiridolactones
The resolution of alpha-alkyl-alpha-hydroxymethylcyclopentanones 1 and cyclohexanones 3 has been efficiently achieved by using lipase-catalyzed transesterification reactions with vinyl acetate as the acylating agent. The enantiomeric selectivities were dependent on both the ring size of the cycloalkanone and the bulk of the carbon group located at the stereogenic quaternary center. The resolved alpha-alkyl-alpha-hydroxymethylcyclopentanones 1 were used as enantiopure (or enantioenriched) precursors for the synthesis of the optically active pseudoiridolactones 6-7. (C) 2010 Elsevier Ltd. All rights reserved.
Bicyclic delta-lactones with a carbon group at the bicyclic junction C-7a, designed as pseudoiridolactones, were synthesized from alpha-alkyl-alpha-hydroxymethylcyclopentanones via an intramolecular Horner-Wadsworth-Emmons reaction. (c) 2007 Elsevier Ltd. All rights reserved.