2-(6-{5-[3-(6-tert-Butyl-8-fluoro-1-oxo-1H-phthalazin-2-yl)-2-hydroxymethyl-phenyl]-1-methyl-2-oxo-1,2-dihydro-pyridin-3-ylamino}-pyridin-3-yl)-2-methyl-propionic acid methyl ester → 2-(6-{5-[3-(6-tert-butyl-8-fluoro-1-oxo-1H-phthalazin-2-yl)-2-hydroxymethyl-phenyl]-1-methyl-2-oxo-1,2-dihydro-pyridin-3-ylamino}-pyridin-3-yl)-2-methyl-propionic acid

Participants

Reaction Steps

2-(6-{5-[3-(6-tert-Butyl-8-fluoro-1-oxo-1H-phthalazin-2-yl)-2-hydroxymethyl-phenyl]-1-methyl-2-oxo-1,2-dihydro-pyridin-3-ylamino}-pyridin-3-yl)-2-methyl-propionic acid methyl ester (390 mg, 0.62 mmol) was dissolved in dioxane (5 ml). Lithium hydroxide monohydride (78 mg, 1.86 mmol) was dissolved in 5 ml of water and added dropwise. The reaction was heated at 50 degrees centigrade for three hours. The reaction mixture was concentrated, ethyl acetate was added and the layers were separated. The aqueous layer was acidified with 1 M HCL. Ethyl acetate was added and the layers were separated. The organic layer was dried and concentrated. Isopropyl acetate was added to the residue and the mixture was heated to form a solution which was cooled to room temperature and allowed to stand at room temperature for several hours. The amorphous solid was filtered and dried to give 325 mg (86%) of 2-(6-{5-[3-(6-tert-butyl-8-fluoro-1-oxo-1H-phthalazin-2-yl)-2-hydroxymethyl-phenyl]-1-methyl-2-oxo-1,2-dihydro-pyridin-3-ylamino}-pyridin-3-yl)-2-methyl-propionic acid. A portion of this material was recrystallized from acetonitrile to provide a crystalline solid. MS: (M+H)+=612; MP=218.0-220.0° C. 1H NMR (300 MHz, DMSO-d6) δ ppm 1.38 (s, 9 H) 1.46 (s, 6 H) 3.17 (d, J=4.91 Hz, 1 H) 3.60 (s, 3 H) 4.27-4.42 (m, 2 H) 4.57-4.66 (m, 1 H) 7.26 (d, J=8.69 Hz, 1 H) 7.33-7.45 (m, 3 H) 7.54 (s, 2 H) 7.75 (d, J=13.22 Hz, 1 H) 7.87 (s, 1H) 8.18 (d, J=2.27 Hz, 1 H) 8.51 (d, J=2.64 Hz, 1 H) 8.60 (s, 1 H) 8.65 (d, J=1.89 Hz, 1H) 12.35 (br s, 1 H).

Provenance & Evidence