2-chloro-N,N-dipropylacetamide → [4-(3-{2-[(E)-3,5-Diamino-6-chloro-pyrazine-2-carbonylimino]-1,3,8-triaza-spiro[4.5]dec-8-yl}-3-oxo-propyl)-phenoxy]-acetic acid dipropylcarbamoylmethyl ester

Participants

Reaction Conditions

Reaction Steps

A solution of [4-(3-{2-[(E)-3,5-Diamino-6-chloro-pyrazine-2-carbonylimino]-1,3,8-triaza-spiro[4.5]dec-8-yl}-3-oxo-propyl)-phenoxy]-acetic acid (Step 1) (811 mg, 1.53 mmol) in DMF (30 ml) was treated with 2-chloro-N,N-dipropyl-acetamide (813 mg, 4.59 mmol) and sodium hydrogen carbonate (808 mg, 8.92 mmol). The reaction mixture was heated at 70° C. for 7 days. The reaction was allowed to cool to RT and diluted with water (100 ml). A white precipitate formed which was extracted into EtOAc (2×75 ml) and DCM (2×75 ml). The organic extracts were combined, dried over MgSO4 and concentrated in vacuo to afford a brown oil. Purification by chromatography on silica eluting with a gradient of 0-20% EtOH/DCM afforded a yellow oily solid which was dissolved in DCM (˜5 ml) and filtered through a 2 μM syringe filter. The solution was concentrated in vacuo to 1 ml, and diethyl ether (10 ml) was added. The resulting white precipitate was collected by filtration and dried in vacuo at 50° C. overnight to afford the title compound; 1H NMR (400 MHz, DMSO-d6) δ 9.10-7.94 (1H br), 8.43 (1H br s), 8.36 (1H, br s), 7.15 (2H, d), 6.96-6.45 (1H, br s), 6.86 (2H, d), 6.72 (2H, br s), 4.88 (2H, s), 4.81 (2H, s), 3.62-3.37 (4H, m), 3.38 (2H, s), 3.19-3.14 (4H, m), 2.74 (2H, t), 2.59 (2H, t), 1.67-1.54 (4H, m), 1.54-1.45 (4H, m), 0.85 (3H, t), 0.80 (3H, t). LC-MS Rt 4.45 mins; 672.5 [M+H]+, Method 10minLC_v003.

Provenance & Evidence