Synthesis of cyclopentitols by ring-closing approaches.

Chemistry of 4-Hydroxy-2-cyclopentenone Derivatives

Novel Strategy for Oligosaccharide Synthesis Featuring Reiterative Alkynol Cycloisomerization

Imidazolium-based phosphinite ionic liquid (IL-OPPh2) as Pd ligand and solvent for selective dehalogenation or homocoupling of aryl halides

Two routes to terrein (1), employing a novel ring contraction of 6-alkoxy-2,3-dihydro-6H-pyran-3-ones (5, 13) are described. Separation into enantiomers was carried out by classical resolution via diastereomeric camphanic acid ester intermediates (14, 15). A new method for cleavage of the 2-(trimethylsilyl)ethyl protecting group in the presence of acid and base sensitive functionality is reported.

A total synthesis of racemic and optically active terrein (trans-4,5-dihydroxy-3-[(E)-1-propenyl]-2-cyclopenten-1-one).

Improved procedure for the synthesis of 6-alkoxy-2,3-dihydro-6h-pyran-3-ones (2,3-dideoxy-dl-pent-2-enopyranos-4-uloses). Neat conversion into polyfunctionalized cyclopentenones

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Improved procedure for the synthesis of 6-alkoxy-2,3-dihydro-6h-pyran-3-ones (2,3-dideoxy-dl-pent-2-enopyranos-4-uloses). Neat conversion into polyfunctionalized cyclopentenones