Triphenylphosphine → 1-Methoxypropylthiazole

Beteiligte Stoffe

Reaktionsschritte

Diethyl azodicarboxylate (0.38 ml) was added dropwise to a mixture of 2-[1-(3 hydroxyphenyl)-1-methoxypropyl]thiazole (0.37 g), triphenylphosphine (0.57 g), 3-(3-pyridyl)prop-2-en-1-ol (0.27 g) and tetrahydrofuran (7 ml) which had been cooled to 0°-5° C. in an ice-bath. The mixture was stirred at this temperature range for 2 hours and then at ambient temperature for 4 hours. Further portions of diethyl azodicarboxylate (0.1 ml), triphenylphosphine (0.14 g) and the propenol (0.045 g) were added and the mixture was stirred at ambient temperature for 18 hours. The mixture was partitioned between ethyl acetate (40 ml) and dilute aqueous hydrochloric acid (40 ml). The aqueous layer was separated and basified by adding potassium carbonate portionwise. The resulting solution was extracted with ethyl acetate (3×20 ml). The combined extracts were dried (Na2SO4) and evaporated. The residue was purified by column chromatography eluting with toluene/ethyl acetate (2/3 v/v) to give 2-[1-[3-(3-pyridyl)prop-2-en-1-yloxy)phenyl[-1-methoxypropylthiazole as a colourless oil (0.162 g).

Herkunft & Nachweise