Acetic Acid → HCID 86616137, compound

Temperature

-78 °C

A solution of (4S)-4-benzyl-3-[(3S)-5,5,5-trifluoro-3-methylpentanoyl]-1,3-oxazolidin-2-one (8.2 g, 24.90 mmol) in THF (100 mL) was cooled to −78° C. and KHMDS (potassium hexamethyldisilazane—59.7 mL, 29.88 mmol) was added dropwise over a period of 10 min. After stirring at −78° C. for 1 h, a pre-cooled (−78° C., 50 min) solution of 2,4,6-triisopropylbenzenesulfonyl azide (10.1 g, 32.37 mmol) was added via cannula over a period of 10 min. After an additional 10 min at −78° C., glacial acetic acid (6.7 mL, 112.05 mmol) was added all at once through a funnel. After 5 min at −78° C. anhydrous potassium acetate (9.77 g, 99.6 mmol) was added. The −78° C. bath was lowered and the reaction mixture was allowed to warm to 25° C. overnight (19 h). The reaction mixture was diluted with EtOAc (200 mL) and the organic phase was washed with saturated aqueous potassium phosphate monobasic (2×100 mL) and saturated aqueous NaCl (100 mL). The organic layer was dried over MgSO4, filtered and concentrated to obtain a yellow oil (9.5 g). The crude product was purified by flash chromatography, eluent: 1:4 EtOAc-hexane, to furnish (S)-3-[(2S,3R)-2-azido-5,5,5-trifluoro-3-methylpentanol]-4-benzyl-1,3-oxazolidin-2-one as a colorless oil (7.2 g, 73.7%). Mass Spectrum (−ESI): 342 (M−N2)−.

1. additionwas added via cannula over a period of 10 min
2. waitAfter an additional 10 min at −78° C.
3. customThe −78° C. bath
4. temperatureto warm to 25° C. overnight (19 h)
5. washthe organic phase was washed with saturated aqueous potassium phosphate monobasic (2×100 mL) and saturated aqueous NaCl (100 mL)
6. dry with materialThe organic layer was dried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated

ORD record

ord-d08a55f2cd3b443ba859a4caab9fd232

Source dataset

uspto-grants-2010_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07858658B2