Lithium Hydroxide → HCID 68747249, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of (S)-ethyl 6-(6-(3-ethylureido)-4-(4-(trifluoromethyl)thiazol-2-yl)pyridin-3-yl)-7-fluoro-1-(1-hydroxy-3,3-dimethylbutan-2-yl)-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylate Intermediate 76 (200 mg, 0.31 mmol, 1 equiv.) in THF (1.2 mL) was added 1-methylpiperazine (0.041 mL, 0.37 mmol, 1.2 equiv.). This reaction was stirred at 50° C. for 10 h. 2 M lithium hydroxide (0.307 mL) was added. The reaction was stirred at 50° C. for 2 h, cooled to room temperature, and diluted with water. 10% wt. sol. of methanesulfonic acid was added until pH 5-6 was reached. The precipitate was discarded. The solution was partitioned between water (10 mL) and ethyl acetate (10 mL). The aqueous layer was extracted with ethyl acetate (2×20 mL), and the aqueous layer was concentrated. The compound was purified (HPLC) and concentrated to provide (S)-6-(6-(3-ethylureido)-4-(4-(trifluoromethyl)thiazol-2-yl)pyridin-3-yl)-1-(1-hydroxy-3,3-dimethylbutan-2-yl)-7-(4-methylpiperazin-1-yl)-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid as a solid (52.8 mg, 22%). Calcd for C32H37F3N8O5S [M+H]+: 703.2. H1NMR (d6-DMSO) δ 15.18 (s, 1H), 9.51 (s, 1H), 8.8 (d, 1H), 8.51 (s, 1H), 8.48 (s, 1H), 8.36 (s, 1H), 8.2 (s, 1H), 7.6 (m, 1H), 5.71-5.68 (m, 1H), 5.09-5.02 (m, 1H), 4.09-4.0 (m, 2H), 3.29-3.27 (m, 2H), 3.21-3.19 (m, 2H), 3.15-3.04 (m, 2H), 2.18-2.14 (m, 2H), 2.05 (s, 3H), 1.95-1.91 (m, 2H), 1.12 (t, 3H), 0.95 (s, 9H).

Provenance & Evidence