Sucrose → HCID 11105894, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A suspension of baker's yeast (Saf-Instant yeast, 30 g) in water (700 mL) was treated with sucrose (142 g). The mixture was stirred at 25° C. for 6 h. At this time, 4-hydroxy-5,6-dihydro-2H-thiopyran-3-carboxylic acid methyl ester (4.06 g, 23.31 mmol) was added. The resulting slurry was stirred at 25° C. for 22 h and then was filtered through a pad of celite. The filtrate was extracted with ethyl acetate (5×300 mL). The combined organic extracts were washed with a saturated aqueous sodium chloride solution (1×150 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40M, Silica, 3/1 hexanes/ethyl acetate) afforded 4(S)-hydroxy-tetrahydro-thiopyran-3(R)-carboxylic acid methyl ester (4.08 g, 99.3%) as a colorless oil: [α]23589=+37.76° (c=2.9, methanol)

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