反应详情

A mixture of 3-methoxynitrostyrene (6.96 g, 39 mmol) and ethyl-3-pyrrolidino-2-butenoate (7.10 g, 39 mmol) was refluxed in ethanol (100 mL) for 4.0 h. The solvent was then removed and the residue refluxed in 10% HCl (50 mL) for 2.0 h. After cooling to ambient temperature the reaction mixture was extracted with ethyl ether (3×25 mL). The extract was dried (MgSO4) and the solvent removed to yield 9.40 g of crude material as an oil. This was distilled twice using a Kugelrohr oven (225° C. C/0.4mm Hg) yielding 4.83 g of product. This was further purified by flash chromatography (n-hexane/ethyl acetate 1/1), yielding 3.25 g (35%) of a colorless oil.: MS (EI) m/e 237.15 (M+, 22), 190.05 (100), 175.05 (32), 149.05 (35), 148.05 (37), 134.05 (36), 115 (10, 20), 91.00 (28), 77.00 (21).

1. customThe solvent was then removed
2. temperaturethe residue refluxed in 10% HCl (50 mL) for 2.0 h
3. extractionwas extracted with ethyl ether (3×25 mL)
4. dry with materialThe extract was dried (MgSO4)
5. customthe solvent removed
6. customto yield 9.40 g of crude material as an oil
7. distillationThis was distilled twice
8. custom(225° C. C/0.4mm Hg)