反应详情

To a solution of [1-(2,3-dihydrobenzo[1,4]dioxin-2-ylmethyl)-3-ethylpiperidin-3-yl]methanol (0.40 g, 1.37 mmol) in DCM (1.5 ml) was added 50% NaOH (6 ml), tetrabutylammonium hydrogensulfate (0.46 g, 1.37 mmol) and tert-butyl bromoacetate (5.35 g, 27.45 mmol). The reaction mixture was stirred at RT for 24 h. Water was added, the reaction mixture was extracted with EtOAc (3×10 ml). The combined organic phases were dried over Na2SO4, filtered and the filtrate was evaporated to give 3-(2-tert-butoxy-ethoxymethyl)-1-(2,3-dihydrobenzo[1,4]dioxin-2-ylmethyl)-3-ethylpiperidine. This crude intermediate (0.20 g, 0.50 mmol) in dry THF (2 ml) was then added to a suspension of LiAlH4 (0.19 g, 5.00 mmol) in dry THF (4 ml). The reaction mixture was refluxed for 1.5 h. Water was slowly added and the reaction mixture was extracted with EtOAc (3×10 ml). The combined organic phases were dried over Na2SO4, filtered and the filtrate was evaporated to give the crude product, which was purified by column chromatography (EtOAc/heptane, 50:50).

1. extractionthe reaction mixture was extracted with EtOAc (3×10 ml)
2. dry with materialThe combined organic phases were dried over Na2SO4
3. filtrationfiltered
4. customthe filtrate was evaporated