5,8-dimethoxynaphthalene-1,4-dione

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

Procedure: 0.45 mM 5,8-dimethoxy-1,4-naphthoquinone (4) which had been prepared above was dissolved in 30 ml of methanol in 100 ml one-neck round flask and then, 0.687 mmol methylamine was added thereto and stirred at room temperature for 3 hours 0.64 mM sodium dichromate and 0.18 mM sulfuric acid dissolved in water were slowly dropped to the reaction mixture and stirred at room temperature for 3 minutes. Then, 50 ml of saturated sodium chloride was added to the reaction mixture, followed by extraction three times with 50 ml of chloroform and obtained organic layers were gathered and dehydrated with anhydrous sodium sulfate and filtered. The filtrate was concentrated under reduced pressure and the residue was subjected to silicagel column chromatography, thereby producing 2-methylamino-5,8-dimethoxy-1,4-naphthoquinone that was reddish brown. The yield and properties of the synthesized compound are as follows. were slowly dropped to the reaction mixture followed by extraction three times with 50 ml of chloroform obtained organic layers filtered The filtrate was concentrated under reduced pressure The yield

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

Procedure: 0.45 mM 5,8-dimethoxy-1,4-naphthoquinone (4) which had been prepared above was dissolved in 30 ml of methanol in 100 ml one-neck round flask and then, 0.687 mmol methylamine was added thereto and stirred at room temperature for 3 hours 0.64 mM sodium dichromate and 0.18 mM sulfuric acid dissolved in water were slowly dropped to the reaction mixture and stirred at room temperature for 3 minutes. Then, 50 ml of saturated sodium chloride was added to the reaction mixture, followed by extraction three times with 50 ml of chloroform and obtained organic layers were gathered and dehydrated with anhydrous sodium sulfate and filtered. The filtrate was concentrated under reduced pressure and the residue was subjected to silicagel column chromatography, thereby producing 2-methylamino-5,8-dimethoxy-1,4-naphthoquinone that was reddish brown. The yield and properties of the synthesized compound are as follows. were slowly dropped to the reaction mixture followed by extraction three times with 50 ml of chloroform obtained organic layers filtered The filtrate was concentrated under reduced pressure The yield

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

Procedure: 0.45 mM 5,8-dimethoxy-1,4-naphthoquinone (4) which had been prepared above was dissolved in 30 ml of methanol in 100 ml one-neck round flask and then, 0.687 mmol methylamine was added thereto and stirred at room temperature for 3 hours 0.64 mM sodium dichromate and 0.18 mM sulfuric acid dissolved in water were slowly dropped to the reaction mixture and stirred at room temperature for 3 minutes. Then, 50 ml of saturated sodium chloride was added to the reaction mixture, followed by extraction three times with 50 ml of chloroform and obtained organic layers were gathered and dehydrated with anhydrous sodium sulfate and filtered. The filtrate was concentrated under reduced pressure and the residue was subjected to silicagel column chromatography, thereby producing 2-methylamino-5,8-dimethoxy-1,4-naphthoquinone that was reddish brown. The yield and properties of the synthesized compound are as follows. were slowly dropped to the reaction mixture followed by extraction three times with 50 ml of chloroform obtained organic layers filtered The filtrate was concentrated under reduced pressure The yield