反应详情

A solution of 1,4-benzodioxan-6-amine (2.00 g, 13.2 mmol), bis-(2-choroethyl)amine hydrochloride (3.54 g, 19.8 mmol). and potassium carbonate (1.83 g, 13.2 mmol) in of 20 mL chlorobenzene is heated to reflux for 24 hours. The dark brown reaction mixture is then partitioned between 3N NaOH and methylene chloride. The organic layer is separated, dried over Mg2SO4, filtered and concentrated. Purification by flash column chromatography (8% methanol/methylene chloride on silica) provides 0.88 g (30%) of the desired 1-(1,4-benzodioxan-6-yl)piperazine as a white solid (m.p. 138° C., TLC Rf 0.37 with 10% methanol/methylene chloride).

1. temperatureto reflux for 24 hours
2. customThe dark brown reaction mixture is then partitioned between 3N NaOH and methylene chloride
3. customThe organic layer is separated
4. dry with materialdried over Mg2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customPurification by flash column chromatography (8% methanol/methylene chloride on silica)