(3R,4S,5R,6R)-3,4,5-Tris-trimethylsilanyloxy-6-trimethylsilanyloxymethyl-tetrahydro-pyran-2-on → HCID 59235394, compound

Participants

Reaction Conditions

Reaction Steps

To a cold (−60° C.) solution of 4-bromo-1-chloro-2-(4-(2-(2,2-difluoroethoxy)ethoxy)benzyl)benzene (4 g, 9.9 mmol) in dry THF/toluene (2:1, 18 mL) was slowly added dropwise a solution of n-butyllithium in hexane (2.5 M, 4.7 mL), and the pale yellow solution was stirred for 30 minutes at −60° C. A solution of (3R,4S,5R,6R)-3,4,5-tris(trimethylsilyloxy)-6-((trimethylsilyloxy)methyl)tetrahydro-2H-pyran-2-one (6 g, 12.8 mmol) in toluene (15 mL) was added dropwise at a rate that maintained the temperature below −55° C., and the mixture was stirred for 2 hr at −60° C. The reaction mixture was quenched by addition of MeOH (24 mL) containing methanesulfonic acid (2 mL). The reaction was stirred overnight at RT, and then aqueous sodium hydrogen carbonate solution (30 mL) was added. The organic layer was separated, the aqueous phase was extracted with ethyl acetate (30 mL) and the combined organic extracts were dried over sodium sulfate. The product was concentrated to give a residue (5.4 g), which was used in the next step without further purification.

Provenance & Evidence