Water → (S)-methyl 2-((tert-butoxycarbonyl)amino)-3-(4-(((perfluorobutyl)sulfonyl)oxy)-phenyl)propanoate

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Reaction Steps

A stirred solution of (S)-methyl 2-((tert-butoxycarbonyl)amino)-3-(4-hydroxyphenyl)propanoate (1.257 g, 4.26 mmol), DMAP (26 mg, 0.213 mmol), and triethylamine (0.71 mL, 0.51 g, 5.11 mmol) in anhydrous DCM (15 mL) was cooled to 0° C. Then nonafluorobutanesulfonyl fluoride (0.82 mL, 1.41 g, 4.68 mmol) was added in one portion. The mixture was allowed to warm and stirred at room temperature. After 18 hours, the mixture was poured into water (80 mL) and extracted with DCM (2×100 mL). The combined organic layers were washed with brine (50 mL), dried over sodium sulfate, and concentrated under reduced pressure. The resultant residue was chromatographed using a Biotage™ 50 g silica gel cartridge by eluting with 0-10% EtOAc in 1:1 Hexane/DCM over 10 column volumes. The product fractions were combined and concentrated under reduced pressure to give the desired product as a clear, colorless oil. LC-MS: calculated for C19H20F9NO7S 577.08, observed m/e: 478.14 (M+H with loss of BOC)+ (Rt 2.67/4 min).

Provenance & Evidence