Dichloromethane → 6-tert-Butyl-2-(3-{5-[5-(2-dimethylamino-1,1-dimethyl-ethoxy)-pyridin-2-ylamino]-1-methyl-6-oxo-1,6-dihydro-pyridazin-3-yl}-2-hydroxymethyl-phenyl)-8-fluoro-2H-phthalazin-1-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-(6-tert-butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)-6-(5-(5-(1-(dimethylamino)-2-methylpropan-2-yloxy)pyridin-2-ylamino)-1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)-benzyl acetate (292 mg, 0.43 mmol) in dioxane (1.5 ml) was added a solution of 2N sodium hydroxide (2.5 ml, 5 mmol). The flask was heated at 50° C. (oil bath) with vigorous stirring under argon atmosphere for 3 hours. The material was cooled to ambient and the contents were taken up in water (25 ml) and methylene chloride (50 ml) and transferred to a reparatory funnel and shaken. The organic phase was collected and washed with a solution of 50% diluted brine (25 ml). The aqueous phases were back extracted with methylene chloride (2×40 ml) and the organic phases combined, dried (magnesium sulfate), filtered and stripped. The remainder was purified by preparative thin layer chromatography (3 plates), eluting with 6% methanol/dichloromethane and then re-developing the plates with first 8% and then 11% methanol/dichloromethane. The product band was collected providing the desired product as a light yellow-white solid (72 mg). MP=136-144° C.; (M+H)+=642 m/e. 1H NMR (300 MHz, CHLOROFORM-d) δ ppm 1.28 (s, 6H) 1.42 (s, 9H) 2.40 (s, 6H) 2.51 (s, 2H) 3.90 (s, 3H) 4.42 (s, 2H) 6.90 (d, J=9.06 Hz, 1H) 7.33 (dd, J=8.69, 3.02 Hz, 1H) 7.41-7.72 (m, 5H) 8.09 (d, J=3.02 Hz, 1H) 8.20-8.35 (m, 2H) 8.53 (s, 1H).

Provenance & Evidence