Potassium Hydroxide → (E)-3-{5-[(E)-3-(4-hydroxymethyl-phenyl)-3-oxo-propenyl]-pyridin-2-yl}-acrylic acid tert-butyl ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of 1-(4-hydroxymethyl-phenyl)-ethanone (750 mg, 5 mmol) in EtOH (15 ml) was added dropwise at 0° C. to a stirred solution of (E)-3-(5-formyl-pyridin-2-yl)-acrylic acid tert-butyl ester (described in Example 11 STEP A-D, 1.16 g, 5 mmol) and 1.7 M KOH (4.4 ml) in EtOH (10 ml). The mixture was stirred at 0° C. for 5 h and the resulting precipitate was filtered and triturated with di-isopropylether to give 630 mg of desired (E)-3-{5-[(E)-3-(4-hydroxymethyl-phenyl)-3-oxo-propenyl]-pyridin-2-yl}-acrylic acid tert-butyl ester. The mother liquors were diluted with water and extracted with AcOEt. The organic layer was dried over Na2SO4 and evaporated in vacuo. The residue was triturated with EtOH to give additional 70 mg of (E)-3-{5-[(E)-3-(4-hydroxymethyl-phenyl)-3-oxo-propenyl]-pyridin-2-yl}-acrylic acid tert-butyl ester.

Herkunft & Nachweise