517891-84-8Relevant articles and documents
Expedient conversion of d-glucose into 1,5-anhydro-d-fructose and into single stereogenic-center dihydropyranones, suitable six-carbon scaffolds for concise syntheses of the soft-coral constituents (-)-bissetone and (-)-palythazine
Brehm, Manfred,Goeckel, Volker H.,Jarglis, Pan,Lichtenthaler, Frieder W.
, p. 358 - 373 (2008/09/19)
High-yielding protocols are described to convert d-glucose-via hydroxylaminolysis of its hydroxyglucal esters, followed by deoximination and β-elimination of acid-into dihydropyranone building blocks with a single stereogenic center. Their versatility as enantiopure six-carbon scaffolds is highlighted by excellent regio- and stereocontrol in a variety of addition reactions and by their straightforward use as building blocks for the concise syntheses of the soft-coral constituents bissetone and palythazine in enantiopure form, thereby proving their absolute configuration. Moreover, several procedures are detailed to convert hydroxyglucal esters into 1,5-anhydro-d-fructose, their parent sugar, the direct low-temperature de-O-acylation being the most suitable for preparative purposes, as long as its access via enzymatic degradation of starch is not implemented on an appreciable scale.
