反应详情

温度

40 °C

17 g (111 mmol) trimethylsilyl bromide are slowly added dropwise to 13.5 g (51 mmol) of compound 2 and the mixture is subsequently stirred for 2 hours at 40° C. Afterwards, it is firstly concentrated in a water-jet vacuum and then in a fine vacuum (0.2 mbar), 70 ml of absolute methanol are added and the mixture is stirred overnight at room temperature. The slightly yellowish, clear solution is concentrated on the rotary evaporator and dried off in fine vacuum (0.2 mbar) at 40° C. until its weight is constant. 13.5 g (100% yield) of a bight yellow oil remain as product, which has a HPLC purity of 98.1%.

1. concentrationAfterwards, it is firstly concentrated in a water-jet vacuum
2. additionin a fine vacuum (0.2 mbar), 70 ml of absolute methanol are added
3. stirringthe mixture is stirred overnight at room temperature
4. concentrationThe slightly yellowish, clear solution is concentrated on the rotary evaporator
5. customdried off in fine vacuum (0.2 mbar) at 40° C. until its weight