2-Aminopyridine → (S)-2-(8-chloro-3-oxo-3,9-dihydro-1H-chromeno[2,3-c]pyrrol-2-yl)-3-cyclohexyl-N-pyridin-2-ylpropionamide

Participants

Reaction Steps

A solution of (S)-2-(8-chloro-3-oxo-3,9-dihydro-1H-chromeno[2,3-c]pyrrol-2-yl)-3-cyclohexyl-propionic acid (200 mg, 2.1 mmol), commercially available 2-aminopyridine (60 mg, 0.63 mmol), N-ethyl-N-dimethyaminopropyl carbodiimide hydrochloride (EDCI. HCl) (112 mg, 0.59 mmol), and N-hydroxybenzotriazole (HOBt) (79 mg, 0.59 mmol) in methylene chloride (10 mL) was stirred for 16 hours at 25° C. The reaction mixture was diluted with water and extracted with ethyl acetate (3×). The combined organic layers were dried over anhydrous sodium sulfate and concentrated in vacuo. The resulting residue, upon silica gel flash chromatography using hexane-ethyl acetate gradiant elution, to afford (S)-2-(8-chloro-3-oxo-3,9-dihydro-1H-chromeno[2,3-c]pyrrol-2-yl)-3-cyclohexyl-N-pyridin-2-ylpropionamide (50 mg, 20.8%), as a white solid. 1H NMR (DMSO-d6) δ: 10.87 (s, 1H), 8.28-8.41 (m, 1H), 8.00 (d, J=8.8 Hz, 1H), 7.70-7.86 (m, 1H), 7.20-7.40 (m, 2H), 7.03-7.16 (m, 2H), 5.09 (br. s., 1H), 5.00-5.01 (m, 1H), 4.36-4.37 (m, 1H), 4.43 (d, J=18.6 Hz, 1H), 4.07 (d, J=18.6 Hz, 3H), 3.99-4.15 (m, 1H), 3.75 (s, 2H), 1.49-1.90 (m, 6H), 1.05-1.29 (m, 4H), 0.88-1.02 (m, 2H).

Provenance & Evidence