Silane, tris(1-methylethyl)- → HCID 58843597, compound

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Reaction Steps

1.56 Moles of n-hexane solution of n-butyllithium (50 ml) were added dropwise to a solution of 1-(benzyloxy)-2-bromo-4-methylbenzene (20 g) in tetrahydrofuran (250 ml) at −78° C. in an argon atmosphere, and the mixture was stirred for one hour at the same temperature. To the reaction mixture was added dropwise a solution of 2,3,4,6-tetra-0-benzyl-D-(+)-glucono-1,5-lactone (35.0 g) in tetrahydrofuran (200 ml) at −78° C., and the resulting mixture was stirred for one hour at the same temperature. Aqueous solution of 1M hydrochloric acid (10 ml) was added to the mixture, and the temperature was raised to room temperature. Then, anhydrous magnesium sulfate (50 g) was added to the mixture, and the mixture was stirred for one hour at room temperature. After filtration, the filtrate was concentrated, and the resulting residue was purified by silica gel column chromatography (n-hexane-ethyl acetate) to obtain 2,3,4,6-tetra-0-benzyl-1-C-[2-(benzyloxy)-5-methylphenyl]-D-glucopyranose (37 g). Triisopropylsilane (31 ml) and borontrifluoride diethylether complex (12.6 ml) were added to a solution of 2,3,4,6-tetra-O-benzyl-1-C-[2-(benzyloxy)-5-methylphenyl]-D-glucopyranose in dicyclomethane-acetonitrile (1:3) (400 ml) under cooling with ice in an argon atmosphere, and the mixture was stirred for one hour at the same temperature. The reaction mixture was poured into saturated aqueous solution of sodium bicarbonate and extracted with chloroform. The organic layer was dried over anhydrous magnesium sulfate and filtrated, and then the solvent was evaporated from the filtrate under reduced pressure to give the residue. The residue was purified by silica gel column chromatography (n-hexane-ethyl acetate) to obtain (1S)-1,5-anhydro-2,3,4,6-tetra-O-benzyl-1-[2-(benzyloxy)-5-methylphenyl]-D-glucitol (16.9 g).

Provenance & Evidence