(3,4-Dihy-droxy-oxolan-2-yl)methyl 4-methyl-benzene-sulfonate

The racemic title compound, C₁₂H₁₆O₆S, possesses a five-membered ring that adopts an envelope-shaped conformation; the two hy­droxy groups occupy quasi-axial positions. Adjacent mol­ecules are linked by O—H⋯O hydrogen bonds to generate a ribbon that runs along the a axis of the ortho­rhom­bic unit cell. The crystal studied was an inversion twin.

Recent applications of olefin metathesis to combinatorial chemistry

Olefin metathesis has emerged as a versatile technology for the synthesis of combinatorial libraries with regard to both scaffold creation and embellishment. The incessant pursuit of 'next-generation' catalysts continues to raise the bar in terms of efficiency, functional group tolerability, diminished reaction times and temperatures and has helped foster both diversity-oriented and target-directed efforts. This report summarizes recent contributions in the area of olefin cross-metathesis and ring-closing metathesis as applied to combinatorial and parallel synthesis. These examples include generation of dimeric benzo[b]furans as novel probes for protein-protein interaction, a cross-metathesis approach to 'traceless linkers' for azide-containing sugars, stereo-diversified synthesis of 1,4- and 1,5-enediols, a novel mannitol derived combinatorial scaffold, parallel synthesis strategies for aza-sugars, as well as the synthesis of dehydro-Freidinger lactams.

The Use of a Mannitol-Derived Fused Oxacycle as a Combinatorial Scaffold

An efficient and high-yielding solid-phase synthesis of a small library of compounds containing a cis-fused pyranofuran structural motive is described. With use of the cheap and readily available D-(+)-mannitol, a highly functionalized sugar template was synthesized and immobilized on a solid support via an olefinic linker. Modification of this two-point molecular scaffold and subsequent ring-closing metathesis/cleavage gave access to a series of functionalized conformationally constrained fused oxacycles.