Potassium Hydroxide → (E)-3-(5-{(E)-3-[4-(4-benzyl-piperazin-1-yl)-phenyl]-3-oxo-propenyl}-pyridin-2-yl)-acrylic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of 1-[4-(4-benzyl-piperazin-1-yl)-phenyl]-ethanone (319 mg, 1.085 mmol), (E)-3-(5-formyl-pyridin-2-yl)-acrylic acid tert-butyl ester (described in Example 11 STEP A-D, 253 mg, 1.08 mmol) and KOH 1.7 M (0.638 ml) in EtOH (10 ml) was stirred at 0° C. overnight. The resulting precipitate was filtered washing with hot EtOH and the powder was dissolved in DCM (10 ml) and treated with TFA (2 ml) for 6 h. The solvent was then removed in vacuo to give 388 mg of (E)-3-(5-{(E)-3-[4-(4-benzyl-piperazin-1-yl)-phenyl]-3-oxo-propenyl}-pyridin-2-yl)-acrylic acid as its bis-trifluoroacetate salt.

Provenance & Evidence