反应详情

To a mixed solution of a commercially available product of 1-(diphenylmethyl)azetidin-3-one (300 mg, 1.26 mmol), THF (6.0 mL) and acetic acid (500 μL) was added a commercially available product of tert-butyl(2R)-2-methylpiperazine-1-carboxylate (304 mg, 1.51 mmol) at room temperature. The resultant mixture was stirred at room temperature for 25 minutes. Sodium triacetoxyborohydride (536 mg, 2.52 mmol) was added to the reaction mixture at room temperature, and the resultant mixture was stirred at room temperature for 18 hours and 35 minutes. Sodium hydrogen carbonate and water were added to the reaction mixture, and the resultant solution was extracted with ethyl acetate. An organic layer was washed with saturated brine, then dried over anhydrous magnesium sulfate and then filtrated. The resultant residue was purified by NH silica gel column chromatography (heptane:ethyl acetate=5:1) to give the title compound (476 mg, yield: 90%).

1. extractionthe resultant solution was extracted with ethyl acetate
2. washAn organic layer was washed with saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationfiltrated
5. customThe resultant residue was purified by NH silica gel column chromatography (heptane:ethyl acetate=5:1)