Methane, dichloromethoxy- → 1-Ethyl-5-formyloxindole

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of 32.2 g. (0.2 mole) of 1-ethyloxindole in 200 ml. of methylene chloride was added 44 ml. (0.4 mole) of titanium tetrachloride followed by 22.6 ml. (0.25 mole) of dichloromethyl methyl ether. The reaction was stirred for 10.5 days at 25° C. followed by the addition of additional titanium tetrachloride and dichloromethyl methyl ether every 48 hours. The reaction was poured onto 1 l. of ice and water and extracted with methylene chloride. Concentration of the dried extract gave the crude product which was recrystallized from diethyl ether, 28.6 g. (76% yield), m.p. 126°-127° C.

Herkunft & Nachweise