Imidazole → N-[1-[4-[[t-butyl(dimethyl)silyl]oxy]-3,5-dimethoxyphenyl]ethyl]ethane-1,2-diamine

Participants

Reaction Steps

3′,5′-Dimethoxy-4′-hydroxyacetophenone (1.00 g) was dissolved in dimethylformamide (4 ml), the solution was added with imidazole (1.04 g) and t-butyldimethylchlorosilane (769 mg), and the mixture was stirred at room temperature for 10 hours. The reaction mixture was added with ethyl acetate and saturated aqueous ammonium chloride, the layers were separated, and the organic layer was successively washed 3 times with distilled water, dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure to obtain a crude product. This product was dissolved in methanol (20 ml), the solution was added with ethylenediamine (289 mg), and the mixture was stirred at room temperature for 15 hours. The reaction mixture was added with a suspension of sodium borohydride (289 mg) in tetrahydrofuran (30 ml), and then added with methanol (6 ml), and the mixture was stirred at room temperature for 1.5 hours. The reaction mixture was concentrated under reduced pressure, and then added with chloroform and saturated aqueous ammonium chloride, the layers were separated, and then the organic layer was dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure, and the resulting residue was purified by silica gel column chromatography (chloroform:methanol:28% aqueous ammonia=10:1:0.1) to obtain the title compound (417 mg).

Provenance & Evidence