p-Toluenesulfonic acid monohydrate → 2-Amino-5-(1-isopropoxy-propyl)-4-trifluoromethyl-benzoic acid methyl ester

Participants

Reaction Steps

A solution of 2-acetylamino-5-(1-hydroxy-propyl)-4-trifluoromethyl-benzoic acid methyl ester (394 mg, 1.23 mmol) in 2-propanol (2 mL) at room temperature was treated with p-toluenesulfonic acid monohydrate (75.3 mg, 0.39 mmol) and the reaction was stirred for 13 d at r.t. The reaction mixture was diluted with water and EtOAc and basified to pH 8 with sat. aq KHCO3. The organic phase was washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. The residue was purified by flash chromatography (20 g of silica gel, EtOAc/hexanes (0:1→3:7)) to give the title product (48 mg, 12%). as colorless crystals. m.p.: 54-56° C., ESI-MS: m/z 320 [M+H]+.

Provenance & Evidence