Sodium hydride → (+/-)-[3-((4-Methylbenzoyl)-{1-[3-(3-methyl-[1,2,4]oxadiazol-5-ylmethyl)-4-oxo-3,4-dihydropyrrolo[2,1-f][1,2,4]triazin-2-yl]propyl}-amino)-propyl]-carbamic acid tert-butyl ester

Participants

Reaction Steps

To a mixture of (±)-(2-{1-[(3-tert-butoxycarbonylaminopropyl)-(4-methylbenzoyl) amino]propyl}-4-oxo-4H-pyrrolo[2,1-f][1,2,4]triazin-3-yl)acetic acid methyl ester (Example 7 A, 26 mg, 0.05 mmol) and N-hydroxyacetamidine (Tyger Scientific, 6 mg, 0.08 mmol) in DMF (1 mL), under Ar, was treated with sodium hydride (6.5 mg as 60% dispersion in mineral oil, 0.15 mmol) and stirred at ambient temperature overnight before being diluted with ethyl acetate. The organic layer was washed twice with water and once with brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo. The crude product was purified by preparative HPLC (YMC S5 ODS, 20×250 mm, 30 minute gradient from 66–90% aqueous methanol with 0.1% TFA). The appropriate fractions were combined, neutralized with saturated aqueous sodium bicarbonate, and then concentrated in vacuo to remove methanol. The mixture was extracted with ethyl acetate (3×10 mL). The combined organic layers were washed once each with water and brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo to yield the title compound (5 mg, 18%): 1H NMR (CDCl3) δ 7.45 (m, 1H), 7.21–7.08 (m, 4H), 7.07 (m, 1H), 6.59 (m, 1H), 5.97 (m, 1H), 5.83 (m, 1H), 5.47 (m, 1H), 3.92 (m, 1H), 3.36 (m, 2H), 2.74 (m, 2H), 2.38 (s, 3H), 2.34 (s, 3H), 2.30–1.98 (m, 2H), 1.74–0.80 (m, 14H); MS (ESI+) 564.20 (M++H).

Provenance & Evidence