Diphenylphosphinic chloride → HCID 131735251, compound

Participants

Reaction Steps

To a solution of 1-((S)-2-(tert-butoxycarbonylamino)-3-methylbutanoyl)-2,3-dihydro-1H-pyrrolo[2,3-b]pyridine-2-carboxylic acid (260 mg, 715 μmol, Eq: 1.00) and diisopropylethylamine (375 μL, 2.15 mmol, Eq: 3) in DCM (7.8 mL) was added diphenylphosphinic chloride (372 mg, 300 μL, 1.57 mmol, Eq: 2.2). After stirring for 5 min, 2,6-difluoroaniline (109 μL, 1.07 mmol, Eq: 1.5) was added and the resulting solution was stirred at rt overnight. The reaction mixture was poured into 0.1 M aqueous KHSO4 (20 mL) and the resulting mixture was extracted with EtOAc. The organic layers were concentrated in vacuo and the crude material was purified by flash chromatography (silica gel, 40 g, 0% to 30% EtOAc in hexanes) to give tert-butyl (S)-1-((S)-2-(2,6-difluorophenylcarbamoyl)-2,3-dihydro-1H-pyrrolo[2,3-b]pyridin-1-yl)-3-methyl-1-oxobutan-2-ylcarbamate (100 mg) and tert-butyl (R)-1-((S)-2-(2,6-difluorophenylcarbamoyl)-2,3-dihydro-1H-pyrrolo[2,3-b]pyridin-1-yl)-3-methyl-1-oxobutan-2-ylcarbamate white solid (80 mg), m/z=497 (M+Na).

Provenance & Evidence