反应详情

To a stirred solution of TiCl4 (1M solution in CH2Cl2, 7 ml) and 5-fluoro-benzofuran -3-one (Cagniant, et al., Comptus Rendus des Seances Acad. de Sci., Ser. C, 282:993 (1976), 3.0 g) (3.0 g, 19.7 mmol) in methylene chloride (200 ml) at −10° C., ethyl-1-piperizine carboxylate (commercially available) (3.9 g, 35 mmol) was slowly added. After the addition, the reaction mixture was warmed to room temperature and slowly refluxed for 24 hours. After cooling to room temperature, the reaction was quenched with 2 N aqueous HCl. The organic layer was separated and the aqueous layer was extracted with chloroform. The combined organic layers were washed well with water and dried over anhydrous MgSO4, then filtered and concentrated resulting in a brown oil. Yield: 3.5 g, (60%); MS (ESI) m/z 293 [M+−H]+.

1. additionAfter the addition
2. temperatureslowly refluxed for 24 hours
3. temperatureAfter cooling to room temperature
4. customthe reaction was quenched with 2 N aqueous HCl
5. customThe organic layer was separated
6. extractionthe aqueous layer was extracted with chloroform
7. washThe combined organic layers were washed well with water
8. dry with materialdried over anhydrous MgSO4
9. filtrationfiltered
10. concentrationconcentrated
11. customresulting in a brown oil