反応 #45337

反応方程式

[3-amino-5-(trifluoromethyl)phenyl]methanol

t-butyl nitrite

CHBr3

→

[3-bromo-5-(trifluoromethyl) phenyl]methanol

溶媒

反応条件

後処理

1. 1
   温度was maintained at this temperature for 10 minutes
2. 2
   温度The reaction was then cooled to room temperature
3. 3
   その他purified with 100% hexanes to 20% EtOAc/hexanes (2 columns)

実験手順

[3-amino-5-(trifluoromethyl)phenyl]methanol (900 mg, 4.71 mmol) (Step A, Example 24) was suspended in CHBr3 (9 mL), and t-butyl nitrite (600 μL, 5.04 mmol) was added dropwise by syringe. The reaction was heated slowly to 80° C. and was maintained at this temperature for 10 minutes. The reaction was then cooled to room temperature, diluted with hexanes (50 mL), loaded on a silica gel column, and purified with 100% hexanes to 20% EtOAc/hexanes (2 columns) to afford [3-bromo-5-(trifluoromethyl) phenyl]methanol. Rf=0.31 (25% EtOAc/hexanes). 1H NMR (CDCl3, 500 MHz) δ 7.71 (s, 1H), 7.68 (s, 1H), 7.56 (s, 1H), 4.76 (d, J=5.5 Hz, 2H), 1.86 (t, J=5.7 Hz, 1H).

出典