Triethylsilane → HCID 57809578、化合物

The crude (3R,4S,5S,6R)-2-(4-chloro-3-(4-hydroxybenzyl)phenyl)-6-(hydroxymethyl)-2-methoxytetrahydro-2H-pyran-3,4,5-triol (6.5 g) and triethyl silane (4.03 g, 34.7 mmol) were dissolved in a mixed solvent of methylene chloride (100 mL) and acetonitrile (100 mL). To the resulting mixture was added dropwise boron trifluoride-diethyl etherate complex (5.6 g, 39.5 mmol) at 0° C. After the completion of dropwise addition, the resulting mixture was warmed up to room temperature and stirred for 16 hr. The mixture was quenched with a saturated sodium bicarbonate solution, and extracted with ethyl acetate (250 mL×3). The organic phases were combined, washed with a saturated sodium chloride solution, dried over anhydrous sodium sulphate, and concentrated under a reduced pressure. The resulting crude product was purified with a silica-gel column chromatography (methanol:methylene chloride=0-1:15) to produce 3.8 g of a product in a yield of 46% (three steps in total).