4,7-dimethoxy-1H-indole-2,3-dione

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 4,7-dimethoxy-1H-indole-2,3-dione (1.8 g, 8.7 mmol) in anhydroud N,N-dimethylformamide (20 mL) and anhydrous tetrahydrofuran (120 mL) at ambient temperature was added cesium carbonate (11.4 g, 35.0 mmol), The mixture was stirred at ambient temperature for 30 min and 1-bromo-2-(2-methoxyethoxy)ethane (2.35 mL, 17.4 mmol) was added in one portion. The mixture was stirred at ambient temperature for 16 h, concentrated in vacuo to a small volume and poured into ice water (300 mL). The mixture was extracted with ethyl acetate and the combined organic extracts were filtered through a pad of diatomaceous earth. The filtrate was dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Trituration of the residue in hexanes afforded 4,7-dimethoxy-1-[2-(2-methoxyethoxy)ethyl]-1H-indole-2,3-dione (2.2 g, 82%). The mixture was stirred at ambient temperature for 16 h concentrated in vacuo to a small volume poured into ice water (300 mL) The mixture was extracted with ethyl acetate the combined organic extracts were filtered through a pad of diatomaceous earth The filtrate was dried over anhydrous magnesium sulfate filtered concentrated in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 4,7-dimethoxy-1H-indole-2,3-dione (1.8 g, 8.7 mmol) in anhydroud N,N-dimethylformamide (20 mL) and anhydrous tetrahydrofuran (120 mL) at ambient temperature was added cesium carbonate (11.4 g, 35.0 mmol), The mixture was stirred at ambient temperature for 30 min and 1-bromo-2-(2-methoxyethoxy)ethane (2.35 mL, 17.4 mmol) was added in one portion. The mixture was stirred at ambient temperature for 16 h, concentrated in vacuo to a small volume and poured into ice water (300 mL). The mixture was extracted with ethyl acetate and the combined organic extracts were filtered through a pad of diatomaceous earth. The filtrate was dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Trituration of the residue in hexanes afforded 4,7-dimethoxy-1-[2-(2-methoxyethoxy)ethyl]-1H-indole-2,3-dione (2.2 g, 82%). The mixture was stirred at ambient temperature for 16 h concentrated in vacuo to a small volume poured into ice water (300 mL) The mixture was extracted with ethyl acetate the combined organic extracts were filtered through a pad of diatomaceous earth The filtrate was dried over anhydrous magnesium sulfate filtered concentrated in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 4,7-dimethoxy-1H-indole-2,3-dione (1.8 g, 8.7 mmol) in anhydroud N,N-dimethylformamide (20 mL) and anhydrous tetrahydrofuran (120 mL) at ambient temperature was added cesium carbonate (11.4 g, 35.0 mmol), The mixture was stirred at ambient temperature for 30 min and 1-bromo-2-(2-methoxyethoxy)ethane (2.35 mL, 17.4 mmol) was added in one portion. The mixture was stirred at ambient temperature for 16 h, concentrated in vacuo to a small volume and poured into ice water (300 mL). The mixture was extracted with ethyl acetate and the combined organic extracts were filtered through a pad of diatomaceous earth. The filtrate was dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. Trituration of the residue in hexanes afforded 4,7-dimethoxy-1-[2-(2-methoxyethoxy)ethyl]-1H-indole-2,3-dione (2.2 g, 82%). The mixture was stirred at ambient temperature for 16 h concentrated in vacuo to a small volume poured into ice water (300 mL) The mixture was extracted with ethyl acetate the combined organic extracts were filtered through a pad of diatomaceous earth The filtrate was dried over anhydrous magnesium sulfate filtered concentrated in vacuo