Acryloyl chloride → 8-Nitro-8-phenyl-hexahydro-indolizin-5-one

Beteiligte Stoffe

Reaktionsschritte

To a room temperature solution of 280 mg (2.042 mmol) nitromethyl-benzene in 3 ml dioxane was added a solution of 141 mg (2.042 mmol) 3,4-dihydro-2H-pyrrole (CAS: 638-31-3) in 0.5 ml dioxane. The mixture was stirred at room temperature for 10 min then at 60° C. for 2.5 hours then cooled to 5-10° C. and 198.2 ul (2.45 mmol) acryloyl chloride was added dropwise. The mixture was then warm to room temperature and stirred for 1 hour. The reaction mixture was quenched with saturated sodium bicarbonate and ethylacetate. The aqueous phase was extracted two times with ethylacetate. The combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo to provide 511 mg of light yellow oil. The crude compound was purified with flash column chromatography on silica eluting from n-heptane and ethyl acetate (0 to 40%) to provide 332 mg of an oil that was dissolved in 3 ml dioxane and 816 mg of amberlyst A-21 was added. The reaction mixture was heated to 70° C. overnight cooled to room temperature, amberlyst was filtered and washed with ethylacetate. The filtrate was concentrated in vacuo. The crude compound was purified with flash column chromatography on silica eluting from n-heptane and ethyl acetate (0 to 100%) to provide 329 mg (y: 62%) of title compound as a colorless oil. (M+H+: 261.1)

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