2-Fluoroaniline → tert-butyl (S)-1-((S)-1-((S)-2-(2-fluorophenylcarbamoyl)-2,3-dihydro-1H-pyrrolo[2,3-b]pyridin-1-yl)-3-methyl-1-oxobutan-2-ylamino)-1-oxopropan-2-yl(methyl)carbamate

Participants

Reaction Steps

In a 50 mL round-bottomed flask, (S)-1-((S)-2-((S)-2-(tert-butoxycarbonyl(methyl)amino)propanamido)-3-methylbutanoyl)-2,3-dihydro-1H-pyrrolo[2,3-b]pyridine-2-carboxylic acid (Intermediate 8) (50 mg, 111 μmol, Eq: 1.00) and HATU (50.9 mg, 134 μmol, Eq: 1.2) were combined in DMF to give a colorless solution. Diisopropylethylamine (23.4 μL, 134 μmol, Eq: 1.2) and 2-fluoroaniline (14.9 mg, 134 μmol, Eq: 1.2) were added. The reaction was stirred at rt for 1 h and then partitioned between ethyl acetate and water. The organic layer was washed with brine, dried over Na2SO4 and concentrated in vacuo. The crude material was purified by flash chromatography (silica gel, 12 g, 10% to 40% EtOAc in hexanes) to give tert-butyl (S)-1-((S)-1-((S)-2-(2-fluorophenylcarbamoyl)-2,3-dihydro-1H-pyrrolo[2,3-b]pyridin-1-yl)-3-methyl-1-oxobutan-2-ylamino)-1-oxopropan-2-yl(methyl)carbamate as a colorless oil (39 mg), m/z=542 (M+H).

Provenance & Evidence