2,5-Dioxopyrrolidin-1-yl (4-bromophenoxy)acetate → 2-(4-Bromophenoxy)-N-[(R)-2-(4-hydroxy-3-methanesulfonylaminophenyl)-2-triethylsilyloxyethyl]acetamide

Participants

Reaction Steps

A suspension of N-[5-((R)-2-azido-1-triethylsilyloxyethyl)-2-benzyloxyphenyl]methanesulfonamide (1.84 g) and 10% palladium-carbon (0.18 g) in methanol (15 mL) /methylene chloride (15 mL) was stirred at room temperature for 5 hrs under an atmosphere of hydrogen. The catalyst was removed by filtration, and the solvent was evaporated under reduced pressure to afford N-[5-((R)-2-amino-1-triethylsilyloxyethyl)-2-hydroxyphenyl]methanesulfonamide as a crude product. The crude N-[5-((R)-2-amino-1-triethylsilyloxyethyl)-2-hydroxyphenyl]methanesulfonamide was dissolved in tetrahydrofuran (40 mL), and 2,5-dioxopyrrolidin-1-yl (4-bromophenoxy)acetate (1.39 g) was added to the solution. After being stirred at room temperature for 3 hrs, the reaction mixture was concentrated in vacuo, and the residue was purified by medium-pressure silica gel column chromatography (eluent: n-hexane/ethyl acetate=1/1) to afford the title compound (1.01 g).

Provenance & Evidence