Nitrogen → (4-Bromo-2,3-difluorophenyl)methyl methanesulfonate

温度

0 °C

In a flame dried round-bottomed flask equipped with a magnetic stir bar and under inert atmosphere (N2), a solution of 4-bromo-2,3-difluorobenzyl alcohol (175 mg, 0.70 mmol) in dry CH2Cl2 (2 mL) was treated at 0° C. with Et3N (0.14 mL, 1.01 mmol) followed by DMAP (10 mg, 0.08 mmol) and Ms-Cl (0.06 mL, 0.82 mmol). After stirring at 0° C. for 0.5 h and at rt for 1 h, the reaction was quenched with water (2 mL). The org. layer was dried over MgSO4, filtered, and the solvents were removed under reduced pressure to give crude (4-bromo-2,3-difluorophenyl)methyl methanesulfonate as a yellow oil. This material was dissolved in dry DMF (3 mL) and treated with NaN3 (46 mg, 0.71 mmol) at 80° C. until completion of the reaction. The reaction mixture was then cooled down to rt and partitioned between EA and water. The layers were separated and the org. layer dried over MgSO4, filtered and concentrated under reduced pressure to give crude 1-(azidomethyl)-4-bromo-2,3-difluorobenzene as a colorless oil. LC-MS-conditions 07: tR=0.89 min.

1. customthe reaction was quenched with water (2 mL)
2. dry with materiallayer was dried over MgSO4
3. filtrationfiltered
4. customthe solvents were removed under reduced pressure

ORDレコード

ord-839491b9b6034d81a97323f557b90983

出典データセット

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08563714B2