反応 #46247

反応方程式

HCl

4-bromo-N-methyl-benzene sulfonamide

B(OiPr)3

n-BuLi

→

4-(N-methylsulfamoyl)phenylboronic acid

収率 104.6%

溶媒

THF

反応条件

後処理

1. 1
   抽出The resulting mixture was extracted with EtOAc
2. 2
   乾燥The organic layer was dried over Na2SO4
3. 3
   その他evaporated under reduced pressure

実験手順

To a solution of 4-bromo-N-methyl-benzene sulfonamide (24.9 g, 0.1 mol) and B(OiPr)3 (28.2 g, 0.15 mol) in THF (200 mL) was added n-BuLi (100 mL, 0.25 mol) at −70° C. The mixture was slowly warmed to 0° C., then 10% HCl solution was added until pH 3˜4. The resulting mixture was extracted with EtOAc. The organic layer was dried over Na2SO4, and evaporated under reduced pressure to give 4-(N-methylsulfamoyl)phenylboronic acid (22.5 g, 96%), which was used in the next step without further purification. 1H NMR (DMSO-d6, 300 MHz) δ 8.29 (s, 2H), 7.92 (d, J=8.1 Hz, 2H), 7.69 (d, J=8.4 Hz, 2H), 2.36 (d, J=5.1 Hz, 3H).

出典