2,6-Lutidine → 3,3,3-Trifluoropropyl trifluoromethanesulfonate

Participants

Reaction Steps

To a cold (−25° C.) stirred solution of 2,6-lutidine (18.38 mL, 158 mmol) in DCM (120 mL) was added Tf2O (24.88 mL, 147 mmol) over 3 min, and the mixture was stirred for 5 min. To the reaction mixture was added 3,3,3-trifluoropropan-1-ol (12 g, 105 mmol) over an interval of 3 min. After 2 hr, the reaction mixture was warmed to room temperature and stirred for 1 hr. The reaction mixture was concentrated to half its volume, then purified by loading directly on a silica gel column (330 g ISCO) and the product was eluted with DCM to afford Intermediate S-1A (13.74 g, 53%) as a colorless oil. 1H NMR (400 MHz, CDCl3) δ ppm 4.71 (2H, t, J=6.15 Hz), 2.49-2.86 (2H, m).

Provenance & Evidence