Ammonium Chloride → HCID 69944199, compound

Participants

Reaction Steps

(Dimethylisopropoxysilyl)methylmagnesium chloride was prepared from a solution of 5.74 g (34.4 mmol) of chloromethyldimethylisopropoxysilane in 40 ml tetrahydrofuran and 0.84 g (34.4 mmol) of metallic magnesium. A solution of 4.65 g (17.2 mmol) of (2R)-2′,3′-difluoro-2-(3,4,5,6-tetrahydro-2H-pyran-2-yloxy)propiophenone [prepared as described in Step 7(i) above] in 20 ml of tetrahydrofuran was added to the solution of the Grignard reagent at 0° C. with stirring. The resulting mixture was stirred at ambient temperature for 30 minutes, after which the reaction was stopped by the addition of a saturated aqueous ammonium chloride solution to the reaction mixture. The reaction product was extracted with ethyl acetate. The organic layer was washed with aqueous sodium chloride solution and concentrated to afford 8.1 g of crude (2S,3R)-2-(2,3-difluorophenyl)-1-(isopropoxydimethylsilyl)-3-(3,4,5,6-tetrahydro-2H-pyran-2-yloxy)-2-butanol as an oil.

Provenance & Evidence