Pyridine → (2S,3R,4R,5S)-3,4,5-Tris(benzyloxy)-2-(benzyloxymethyl)-6-(3-(bromomethyl)-4-chlorophenyl)-tetrahydro-2H-pyran

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Reaction Steps

To a solution of (2-chloro-5-((3S,4R,5R,6R)-3,4,5-tris(benzyloxy)-6-(benzyloxy-methyl) tetrahydro-2H-pyran-2-yl)phenyl)methanol (compound 5, 130 g, 195 mmol) from Step 6 in ether (600 mL) at 0° C. was added pyridine (0.79 mL, 9.8 mmol) and phosphorus tribromide (6.4 mL, 68 mmol). The reaction was allowed to slowly warm to room temperature over 15 h and refluxed 1 h. After cooling to room temperature, the reaction mixture was diluted with ethyl acetate and washed with water then brine. The organic extract was dried over magnesium sulfate, filtered, and evaporated in vacuo to yield the title compound as a yellow oil, which was used without further purification.

Provenance & Evidence