Methanol → Methyl (2R)‐2‐{4‐[(5‐chloro‐3‐fluoropyridin‐2‐ yl)oxy]phenoxy}propanoate

Participants

Reaction Steps

A solution of 10.6 g (0.030 mol) of (R)(+)-2-[4-(5-chloro-3-fluoropyridin-2-yloxy)-phenoxy]-propionic acid chloride in 100 ml toluene is added slowly, while stirring into a solution of 4.9 ml (0.035 mol) of triethylamine and 2 ml (0.035mol) of methanol in 40 ml of toluene, that is cooled in an ice/bath. When everything is added, the ice-bath is removed and the reaction mixture is stirred for 3 hours at room temperature. The reaction mixture is then poured into ice-water and the organic material is extracted twice with ethyl acetate. The ethyl acetate layer is washed with a saturated salt solution, dried over magnesium sulfate, filtered and evaporated. The residue is purified by chromatography over a silicagel column with a hexane/ethyl acetate solution. After evaporation of the solvent, a clear oil, the above ester remains n35D 1.5859, [α]20D =+38.8±0.5 (2 % acetone).

Provenance & Evidence