Reaktion #2015860

Reaktionsgleichung

((2S,4R)-4-(tert-Butyldimethylsilyloxy)-6-oxo-tetrahydro-2H-pyran-2-yl)methyl acetate

→

(4R,6S)-4-(tert-butyldimethylsilyloxy)-6-(hydroxymethyl)-tetrahydro-pyran-2-one

Ausbeute 54.2%

Lösungsmittel

MeOH THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeAfter the solvent is removed under reduced pressure
2. 2
   Sonstigethe remained residue is purified by silica gel chromatography (elution with tBuMeO/hexane mixture)
3. 3
   Sonstigeto afford a crude product as white solid (5.59 g, 78%)
4. 4
   SonstigeRecrystallization from n-hexane

Vorschrift

((2S,4R)-4-(tert-Butyldimethylsilyloxy)-6-oxo-tetrahydro-2H-pyran-2-yl)methyl acetate (8.36 g, 27.64 mmol) and [tBu2SnOH(Cl)]2 (1.577 g, 2.764 mmol) are dissolved in MeOH/THF mixture (280 mL). The reaction mixture is stirred at 23-25° C. for 27 h. After the solvent is removed under reduced pressure, the remained residue is purified by silica gel chromatography (elution with tBuMeO/hexane mixture) to afford a crude product as white solid (5.59 g, 78%). Recrystallization from n-hexane affords (3.90 g, 54%) of (4R,6S)-4-(tert-butyldimethylsilyloxy)-6-(hydroxymethyl)-tetrahydro-pyran-2-one as white needles. M.p.=102° C. (DSC peak).

Quelle