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
摘要:
High-yielding protocols are described to convert D-glucose-via hydroxylaminolysis of its hydroxyglucal esters, followed by deoximination and beta-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. (C) 2008 Elsevier Ltd. All rights reserved.
A convenient, versatile entry into the 1,5-anhyroketose series is described and their conversion into enolones, enolone oximes and γ-pyrones.
描述了一种方便,通用的进入1,5-脱水酮糖系列的方法,并将其转换为烯醇酮,烯醇酮肟和γ-吡喃酮。
Structure of 1,5-Anhydro-D-fructose: X-ray Analysis of Crystalline Acetylated Dimeric Forms
作者:Søren M. Andersen、Inge Lundt、Jan Marcussen、I. Søtofte、Shukun Yu
DOI:10.1080/07328309808001881
日期:1998.9.1
Acetylation of 1,5-anhydro-D-fructose under acidic conditions gave two crystalline acetylated dimeric forms, which by X-ray analysis were shown to be diastereomeric spiroketals formed between C-2 and C-2/C-3. The structures of the compounds differed only at the configuration at C-2. Acetylation or benzoylation of 1,5-anhydro-D-fructose in pyridine yielded 3,6-di-O-acetyl-1,5-anhydro-4-deoxy-D-glycero-hex-3-enos-2-ulopyra-nose or crystalline 1,5-anhydro-3,6-di-O-benzoyl-4-deoxy-D-glycero-hex-3-enos-2-ulo-pyranose.
Brehm, Manfred; Dauben, William G.; Koehler, Peter, Angewandte Chemie, 1987, vol. 99, # 12, p. 1318 - 1319
作者:Brehm, Manfred、Dauben, William G.、Koehler, Peter、Lichtenthaler, Frieder W.
DOI:——
日期:——
Jarglis, Pan; Lichtenthaler, Frieder W., Angewandte Chemie, 1982, vol. 94, # 2, p. 140 - 141
作者:Jarglis, Pan、Lichtenthaler, Frieder W.
DOI:——
日期:——
BREHM, MANFRED;DAUBEN, WILLIAM G.;KOHLER, PETER;LICHTENTHALER, FRIEDER W., ANGEW. CHEM., 99,(1987) N 12, 1318-1319
作者:BREHM, MANFRED、DAUBEN, WILLIAM G.、KOHLER, PETER、LICHTENTHALER, FRIEDER W.