To a stirred solution of 2-[2-(acetylamino)pyridin-4-yl]-4-(2-chlorophenyl)-1,3-thiazole-5-carboxylic acid (0.050 g, 0.130 mmol) in methylene chloride (3.00 mL, 46.80 mmol) was added N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (0.056 g, 0.294 mmol) followed by 1-hydroxybenzotriazole (0.040 g, 0.294 mmol) and the resulting solution was stirred for 1 h. Ethanolamine (0.081 mL, 1.340 mmol) was added and the reaction mixture was continued to stir for 18 h. The mixture was quenched by the addition of water (5.0 mL) and extracted with EtOAc (10.0 mL×3). The combined organic layers were dried over anhydrous Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography (SiO2, elution with 0-75% EtOAc in hexanes) to provide 0.0300 g of product as a clear colorless oil (54% 2 steps). LC/MS (AA) ES+417, 419. 1H NMR (400 MHz, d1 CDCl3) δ: 8.06-7.98 (m, 1H), 7.72-7.54 (m, 3H), 7.49-7.44 (m, 2H), 7.02-6.96 (m, 1H), 6.28 (br s, 1H), 4.72 (br t, J=5.6 Hz, 1H), 4.66 (br t, J=5.4 Hz, 1H), 3.37 (q, J=6.0 Hz, 2H), 3.18 (q, J=6.4 Hz, 2H), 2.12 (s, 3H).
