Ethyl 3-ethyl-6-(4-fluorobenzenesulphonylmethyl)-2-methoxybenzoate → 3-Ethyl-6-(4-fluorobenzenesulphonyl-methyl)-2-methoxybenzoic acid

Participants

Reaction Steps

Potassium trimethylsilanoate (0.257 g) was added to a solution of ethyl 3-ethyl-6-(4-fluorobenzenesulphonylmethyl)-2-methoxybenzoate (Intermediate 23, 0.076 g) in dry THF (10 ml). The resultant mixture was stirred at room temperature for 3 days. The mixture was diluted with water and washed with ethyl acetate. The aqueous layer was acidified by careful addition of concentrated hydrochloric acid and then extracted with ethyl acetate, washed with water, dried (MgSO4) and filtered. The filtrate was evaporated to dryness and the residue was purified by preparative HPLC (C18), eluting with a mixture of methanol and water containing 0.1% formic acid with a gradient of 50-80% to give 3-ethyl-6-(4-fluorobenzenesulphonyl-methyl)-2-methoxybenzoic acid (0.014 g) as a white solid.

Provenance & Evidence