反应详情

温度

23 °C

To a solution of diisopropylethylamine (0.86 mL, 4.95 mmol), 1-[5-amino-6-chloro-1-(2-methoxy-ethoxymethyl)-1H-benzoimidazol-2-yl]-1H-pyrazole-4-carboxylic acid ethyl ester (Intermediate from Example 41, product from Step A) (0.650 g, 1.65 mmol), and THF (8 mL) at 0° C., was added bromoacetyl bromide (0.244 mL, 2.81 mmol). The reaction mixture was allowed to slowly warm to 23° C. A second aliquot of bromoacetyl bromide (0.244 mL, 2.81 mmol) was added and the reaction mixture was kept at 23° C. for an additional 25 min. Water was added (20 mL) and the aqueous layer was extracted with EtOAc (2×75 mL). The combined organic layers were washed with brine (25 mL), dried, filtered, and concentrated under reduced pressure. The residue was purified (FCC) (10-45% EtOAc/hexanes) to yield the titled compound (0.361 g, 42% yield) after trituration with EtOAc. A 3:2 mixture of regioisomers was observed in the 1H NMR spectrum. MS (ESI/CI): mass calcd. for C19H21BrClN5O5, 513.0; m/z found, 514.0 [M+H]+. 1H NMR (400 MHz, CDCl3): 8.89 (s, 1H), 8.87 (br s, 1H), 8.71 (s, 1H), 8.18 (s, 1H), 7.70 (s, 1H), 6.13 (s, 2H), 4.36 (q, J=7.2 Hz, 2H), 4.13 (s, 2H), 3.68-3.62 (m, 2H), 3.49-3.43 (m, 2H), 3.31 (s, 3H), 1.38 (t, J=7.1 Hz, 3H).

1. extractionthe aqueous layer was extracted with EtOAc (2×75 mL)
2. washThe combined organic layers were washed with brine (25 mL)
3. customdried
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified (FCC) (10-45% EtOAc/hexanes)