反应详情

A solution acetic acid 1-methyl-prop-2-ynyl ester (prepared by the method of Clarke and Pinder, J. Chem. Soc. 1958, 1967).(7 g) and pyrrolidine (10.4 ml) in anhydrous tetrahydrofuran (125 ml) was treated with copper (I) chloride (0.3 g) and the mixture was heated to reflux temperatures for 1.5 hours. After then allowing the mixture to stir at room temperature for approximately 15 hours, the mixture was diluted with diethyl ether, and extracted thrice with 2N aqueous hydrochloric acid. These pooled acidic extracts were basified by addition of solid sodium hydroxide, and the solution was then extracted three times with ethyl acetate. These pooled organic extracts were then washed with water, brine, and dried over anhydrous magnesium sulfate. After removing the solvent in vacuo the resulting residue was distilled to obtain the desired product as a colorless oil. b.p. 35° C. (1.1 mm Hg). MS(+ES), m/z: 124 (M+H)+.

1. temperaturethe mixture was heated
2. temperatureto reflux temperatures for 1.5 hours
3. extractionextracted thrice with 2N aqueous hydrochloric acid
4. additionThese pooled acidic extracts were basified by addition of solid sodium hydroxide
5. extractionthe solution was then extracted three times with ethyl acetate
6. washThese pooled organic extracts were then washed with water, brine
7. dry with materialdried over anhydrous magnesium sulfate
8. customAfter removing the solvent in vacuo the resulting residue
9. distillationwas distilled