Triethylamine → Biphenyl-4-carboxylic acid (R)-(6-(1-((2-methoxyethyl)methylamino)ethylideneamino)-2(R)-hydroxyindan-1-yl)amide

Participants

Reaction Steps

Dissolve carbamic acid tert-butyl ester (R)-(6-(1-((2-methoxyethyl)methylamino)ethylideneamino)-2(R)-hydroxyindan-1-yl)amide (153.6 mg, 0.407 mmol) in excess TFA at 0° C. and allow to stir for 1 hour. Remove the solvent in vacuo. Dissolve the residue in 10 mL methylene chloride and add triethylamine (411.8 mg, 4.07 mmol) and biphenyl-4-carboxylic acid 2,5-dioxopyrrolidin-1-yl ester (118.3 mg, 0.400 mmol). Allow the reaction mixture to stir for 21 hours. Dilute the reaction mixture with methylene chloride and wash it with saturated aqueous sodium hydrogen carbonate (1×) and brine (1×). Dry the organic layer with magnesium sulfate. Filter and remove the solvent in vacuo to give 162.1 mg of crude product. Purify via Biotage chromatography (30% MeOH/EtOAc) to afford 93.1 mg of the titled product as an oil (50% yield). MS (ES): m/z 458.3(M+H).

Provenance & Evidence