Hydrochloric Acid → [6-Chloro-3-(2.2-difluoro-2-pyridin-2-yl-ethylamino)-2-oxo-2H-pyrazin 1-yl]-acetic Acid

Participants

Reaction Steps

To a stirred solution of 7.27 g (19.5 mmol) of [6-chloro-3-(2,2-difluoro-2-pyridin-2-yl-ethylamino)-2-oxo-2H-pyrazin-1-yl]-acetic acid ethyl ester in 200 mL of methanol was added 39 mL (39.0 mmol) of 1M aq. potassium hydroxide. After 3 h the solution was acidified to pH=7 using conc. HCl, and concentrated at reduced pressure (azeotrope with PhCH3) to give a white solid containing potassium chloride and the product. 1H NMR (CD3OD) δ 8.64 (d, 1H, 4.8 Hz), 7.93 (ddd,1H, 7.7, 7.7, 1.5 Hz), 7.70 (d, 1H, 8.0 Hz), 7.49 (dd, 1H, 5.2, 7.4 Hz), 6.80 (s, 1H), 4.67 (s, 2H), 4.27 (t, 2H, 13.9 Hz).

Provenance & Evidence