反应详情

2-(2,2-difluoroethoxy)ethanol (0.13 g, 1.0 mmol), p-toluenesulfonyl chloride (0.19 g, 1.0 mmol), and DMAP (0.12 g, 1.0 mmol) were dissolved in dichloromethane (2 ml) at 0° C. and stirred for 2 h at this temperature. The reaction mixture was loaded onto a small column, which was eluted with dichloromethane to yield the title compound as a clear oil (53 mg, 19%). It was observed that the size of the column affects reaction yield, with a smaller column giving a better yield. 1H NMR (CDCl3, 300 MHz): δ 7.78 (d, 2H, J=11.2 Hz), 7.34 (d, 2H, J=11.2 Hz), 5.76 (tt, 1H, J1=5.6 Hz, J2=73.6 Hz), 4.17 (t, 2H, J=6.0 Hz), 3.75 (t, 2H, J=6.0 Hz), 3.64 (td, 2H, J1=6.0 Hz, J2=20 Hz), 2.45 (br s, 3H).

1. washwas eluted with dichloromethane