1,2-Bis(2-chloroethoxy)ethane → 3-{2-[2-(2-Chloroethoxy)ethoxy]ethoxy}-4,5-dimethoxybenzaldehyde

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of 500 mg (2.75 mmol) 4,5-dimethoxy-3-hydroxybenzaldehyde 1 and 860 μl (1.03 g, 5.50 mmol) 1,2-bis(2-chloroethoxy)ethane in 20 ml DMF was treated with 2.24 g (6.88 mmol) caesium carbonate and heated to 55° C. for 20 hrs. After cooling the mixture was poured into 100 ml of ice water and extracted with chloroform. The organic extracts were washed twice with 50 ml of water and with brine, dried over sodium sulfate and evaporated. The resulting yellow oil was flash-chromatographed (petroleum ether/ethyl acetate 2/1) to yield 3-{2-[2-(2-chloroethoxy)ethoxy]ethoxy}-4,5-dimethoxybenzaldehyde (730 mg, 2.20 mmol, 80%), which was directly used for the next synthesis step.

Herkunft & Nachweise