The product of Example 101A (59 mg, 0.206 mmole) was dissolved in anhydrous dichloromethane (2.0 mL). To the solution was added 2-pyrazine carboxylic acid (51 mg, 0.412 mmole), 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (79 mg, 0.412 mmole) and 1-hydroxybenzotriazole hydrate (28 mg, 0.206 mmole). The mixture was stirred at room temperature overnight then diluted with water. The pH of the mixture was was adjusted to pH 9 with 1 N NaOH and extracted three times with dichloromethane. The combined organic layers were concentrated to give the crude product. The crude product was purified by column chromatography (0.6% ammonium hydroxide and 6% methanol in dichloromethane) to provide the title compound. 1H NMR (500 MHz, CDCl3) δ ppm 9.81 (s, 1H) 9.54 (d, J=1.53 Hz, 1H) 8.83 (d, J=2.44 Hz, 1H) 8.66 (d, J=2.14 Hz, 1H) 8.58-8.63 (m, 1H) 7.94 (d, J=8.85 Hz, 1H) 7.52 (dd, J=8.85, 2.14 Hz, 1H) 3.52-3.62 (m, 1H) 2.74-2.84 (m, 1H) 2.61-2.72 (m, 2H) 2.24-2.41 (m, 6H) 1.55-1.64 (m, 4H) 1.40-1.52 (m, 2H). MS: (M+H)+=394.
