Iodine → 3-(2-Ethoxy-phenyl)-3-hydroxy-5-methoxy-1,3-dihydro-indol-2-one

Participants

Reaction Steps

40 g (1.65 mol) of magnesium chips and 5% of the total amount of the 2-bromo-1-ethoxy benzene were added to 100 ml diethyl ether and after adding a few crystals iodine the mixture was carefully heated to initiate the reaction. To the refluxing mixture the remaining amount of 203 ml (1.65 mol) 2-bromo-1-ethoxy benzene, dissolved in 450 ml diethyl ether, was added slowly to maintain the reaction. Then 75 g (0.41 mol) of 5-methoxyisatine, suspended in 750 ml THF, were added to the cooled reaction mixture. After stirring the reaction mixture for 30 minutes at ambient temperature, the mixture was poured into an ice/aqueous NH4Cl mixture. The aqueous phase was extracted with ethyl acetate several times and the combined organic phase was washed with H2O, dried over magnesium sulfate and the solvent was removed in vacuo.

Provenance & Evidence