Potassium Hydroxide → 2-(3,4-dimethyl-benzyl)-4-oxo-4-[4-(2-oxo-1,4-dihydro-2H-quinazolin-3-yl)-piperidin-1-yl]-butanoic acid

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Reaction Steps

A solution of 15.5 g (28.2 mmol) diethyl 2-(3,4-dimethyl-benzyl)-2-{2-oxo-2-[4-(2-oxo-1,4-dihydro-2H-quinazolin-3-yl)-piperidin-1-yl]-ethyl}-malonate in 100 mL EtOH was combined with 11.2 g (169.7 mmol) KOH dissolved in 150 mL water and the mixture was refluxed for 5 h. After the addition of another 11.2 g (169.7 mmol) KOH dissolved in 150 mL water the mixture was refluxed again for 5 h, then combined with 150 mL water and the precipitate was suction filtered. The filter cake was dissolved in 500 mL water, washed twice with 100 mL EtOAc and adjusted to pH 4 by the addition of conc. HCl. The precipitate formed was suction filtered and dried in the circulating air dryer.

Provenance & Evidence