4-(1H-imidazol-1-yl)benzaldehyde → (E)-4-[4-(1H-Imidazol-1-yl)phenyl]-3-butenoic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

5.45 g of 4-(1H-imidazol-1-yl)benzaldehyde and 12.93 g of β-carboxyethyltriphenylphosphonium chloride were suspended in 70 ml of tetrahydrofuran. The obtained suspension was cooled to -50° C. and vigorously stirred. 30 ml of a solution of 7.83 g of potassium t-butoxide in tetrahydrofuran was gradually added dropwise to the resulting suspension. The temperature of the obtained mixture was gradually raised to 0° C. After one hour, ice-water was added to the mixture. The obtained mixture was washed with ether. The pH of the aqueous layer was adjusted with concentrated hydrochloric acid to about 4 to precipitate a solid. This solid was recovered by filtration and washed with water and methanol to obtain 5.44 g of the title compound as a pale yellow powder (yield: 75%).

Herkunft & Nachweise