Trifluoroacetic acid → {2-[2-(5-benzyloxy-1H-indazol-3-yl)-1H-indol-5-yloxy]ethyl}diethylamine

Participants

Reaction Conditions

Reaction Steps

A solution containing 1.15 g of 5-benzyloxy-3-[1-tert-butoxycarbonyl-5-(2-diethylaminoethoxy)-1H-indol-2-yl]indazole-1-carboxylic acid tert-butyl ester and 4 ml of trifluoroacetic acid in 5 ml of dichloromethane is stirred at 20° C. for 2 hours. The reaction mixture is evaporated under reduced pressure and the crude compound thus obtained is purified by chromatography (Nucleodur C18 column, 100-10, 250 mm×40 mm, reference No. 762020, series No. 3051181, Batch No. 2023; eluent A: water/0.07% trifluoroacetic acid, eluent B: acetonitrile/0.07% trifluoroacetic acid, gradient of composition A/B of 95%//5% to 5%/95% over 52 minutes at 75 ml/min, detection 300 nm). The fractions containing the expected compound are combined and evaporated under reduced pressure. The compound is taken up in ethyl acetate (20 ml), dried over magnesium sulfate and then evaporated under reduced pressure to obtain 320 mg of {2-[2-(5-benzyloxy-1H-indazol-3-yl)-1H-indol-5-yloxy]ethyl}diethyl-amine, which is characterized.

Provenance & Evidence