Dichloromethane → Trifluoromethanesulfonic acid 1-[4-(2-azepan-1-yl-ethoxy)-phenoxy]-6-methoxy-naphthalen-2-yl ester

Participants

Reaction Steps

Add trifluoromethanesulfonic anhydride (7 mL, 42 mmol) into a solution of 1-[4-(2-azepan-1-yl-ethoxy)-phenoxy]-6-methoxy-naphthalen-2-ol (15 g, 37 mmol), triethylamine (20 mL) and methylene chloride (500 mL) at −50° C. Warm the reaction mixture to room temperature and stir for 1 hour at that temperature. Cool the reaction mixture to −78° C. and add brine (20 ml). Warm the reaction to room temperature. Separate layer and wash the organic layer with saturated sodium bicarbonate solution (100 mL) and brine. Dry the organic layer with magnesium sulfate, filter and evaporate solvent under reduced pressure. Chromatograph the residue on a silica gel column eluting the material with a step gradient of methanol/dichloromethane (0 to 10%) to get 20 g (99%) of trifluoro-methanesulfonic acid 1-[4-(2-azepan-1-yl-ethoxy)-phenoxy]-6-methoxy-naphthalen-2-yl ester.

Provenance & Evidence