Sodium Hydroxide → 4-[3-(6-tert-butyl-1-oxo-1H-phthalazin-2-yl)-2-hydroxymethyl-phenyl]-1H-pyrrole-2-carboxylic acid

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Reaction Steps

To a solution of 4-[2-acetoxymethyl-3-(6-tert-butyl-1-oxo-1H-phthalazin-2-yl)-phenyl]-pyrrole-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester (136 mg, 0.24 mmol) in 5 mL of dioxane and 5 mL of water was added NaOH (40 mg) and the reaction mixture was stirred at room temperature for 20 h. The mixture was concentrated under reduced pressure. The residue was dissolved in 8 mL of water, and acidified with 1 N HCl to pH 3-4. The mixture was extracted with ethyl acetate (5 mL×3). The combined organic layers were dried over Na2SO4 and concentrated under reduced pressure to give 4-[3-(6-tert-butyl-1-oxo-1H-phthalazin-2-yl)-2-hydroxymethyl-phenyl]-1H-pyrrole-2-carboxylic acid (99 mg, yield 100%). LC-MS calcd for C24H23N3O4 (m/e) 417.17, obsd 418 [M+1]+.

Provenance & Evidence