Trifluoroacetic acid → 4-{2-[1-Benzhydryl-6-chloro-2-(2-phenylmethanesulfonylamino-ethyl)-1H-indol-3-yl]-ethoxy}-benzoic acid methyl ester

Participants

Reaction Steps

To N-[2-(1-Benzhydryl-6-chloro-1H-indol-2-yl)-ethyl]-C-phenyl-methanesulfonamide (0.033M, 1 equiv.) in DCM at 0° C. were added 4-(2-oxo-ethoxy)-benzoic acid methyl ester (3.3 equiv.), triethylsilane (6 equiv.), and TFA (5 equiv.). The reaction mixture was stirred at rt for 2d 20 h before aqueous workup. Purification by silica gel chromatography followed by reverse phase HPLC gave 4-{2-[1-Benzhydryl-6-chloro-2-(2-phenylmethanesulfonylamino-ethyl)-1H-indol-3-yl]-ethoxy}-benzoic acid methyl ester in 35% yield.

Provenance & Evidence