Trifluoroacetic acid → (R)-5-{5-[1-(3-chloro-phenyl)-1H-pyrazol-4-yl]-2-fluoro-phenyl}-6,6-difluoro-5,7,7-trimethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-ylamine hydrochloride

Participants

Reaction Steps

A solution of [bis-(4-methoxy-phenyl)-phenyl-methyl]-((R)-5-{5-[1-(3-chloro-phenyl)-1H-pyrazol-4-yl]-2-fluoro-phenyl}-6,6-difluoro-5,7,7-trimethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl)-amine (174 mg, 228 μmol) in dichloromethane (4 ml) was treated at room temperature with trifluoro acetic acid (178·1, 2.28 mmol). The reaction mixture was stirred at room temperature for 16 hours. For the workup, the reaction mixture was evaporated at reduced pressure and the dark red residue was directly purified by chromatography on an amine-silica phase using a gradient of heptane/ethyl acetate=100:0 to 30:60 as the eluent. For further purification, the product (146 mg) was treated with a solution of hydrochloric acid in dioxane (4M, 1 ml). After evaporation at reduced pressure, the residue was triturated with diethyl ether (2 ml). The solid residue was dried at high vacuum an yielded the (R)-5-{5-[1-(3-chloro-phenyl)-1H-pyrazol-4-yl]-2-fluoro-phenyl}-6,6-difluoro-5,7,7-trimethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-ylamine hydrochloride (76 mg, 67% yield) as a white solid. MS (ISP): m/z=463.2 [M+H]+ and 465.2 [M+2+H]+.

Provenance & Evidence