Methanol → 4-Bromo-5-fluoro-2-nitrobenzaldehyde

温度

-78 °C

To a stirred solution of methyl 4-bromo-5-fluoro-2-nitrobenzoate (5.348 g, 19.24 mmol) in DCM (100 mL) at −78° C., a solution of diisobutylaluminum hydride in DCM (1.0 M, 25.0 mL, 25.0 mmol) was added dropwise over a period of 10 min. The mixture was stirred at −78° C. for 2 h. MeOH (10.0 mL) was then added. The reaction mixture was allowed to warm to room temperature. A 10 wt % aqueous solution of sodium tartrate (100 mL) was added to the mixture. The mixture was then stirred vigorously until a distinct bilayer was formed. The mixture was then diluted with DCM (100 mL), washed with water (2×100 mL), brine (2×100 mL), dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel (0-30% EtOAc in Hexanes) to give the sub-title compound as a pale yellow solid (4.19 g, 88%). LCMS calc. for C7H4BrFNO3 (M+H)+: m/z=247.9; found no ionization.

1. temperatureto warm to room temperature
2. stirringThe mixture was then stirred vigorously until a distinct bilayer
3. customwas formed
4. washwashed with water (2×100 mL), brine (2×100 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by flash chromatography on silica gel (0-30% EtOAc in Hexanes)

ORDレコード

ord-94b60332c75d4b89938e0a18c7b8436a

出典データセット

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US09278950B2