反应详情

1-(Ethoxycarbonylmethyl)-piperazine (5.00 g, 29.0 mmol) is dissolved in 35 mL of 50% aqueous dioxane. Triethylamine (4.41 g, 43.5 mmol) is added followed by 2-(tert-butoxycarbonyloxyimino)-2-phenylacetonitrile (7.86 g, 31.9 mmol). The reaction is stirred for 14.5 hours at ambient temperature, then poured onto water and extracted with ethyl acetate (2×100 mL). The combined organic extracts are washed with water (3×100 mL), brine, dried over MgSO4, filtered, and concentrated in vacuo. The residue is purified via silica gel chromatography with gradient elution (20%→50% ethyl acetate in hexanes) affording the desired product as an oil. CIMS: MH+ 273.

1. additionpoured onto water
2. extractionextracted with ethyl acetate (2×100 mL)
3. washThe combined organic extracts are washed with water (3×100 mL), brine
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue is purified via silica gel chromatography with gradient elution (20%→50% ethyl acetate in hexanes)