反应详情

5-Amino-indan (3.00 g, 22.53 mmol) was added slowly to acetic anhydride (10 mL) cooled by an ice water bath. After 15 min., 70% HNO3 (3 mL, 46.99 mmol) was carefully added dropwise so that the temperature remained below 26° C. The mixture was allowed to slowly warm to room temperature and stirred for 2 days. It was then treated with ice water (60 mL) and extracted with EtOAc (3×20 mL). The extract was washed with water, Na2CO3 solution, dried (MgSO4), filtered and concentrated to give a dark oil (3.51 g). It was dissolved in CHCl3 and flash chromatographed over silica gel (180 g) eluting with EtOAc/hexane (1:10) to afford a yellowish orange solid (1.43 g, 29% yield): mp 100°-104° C.

1. temperaturecooled by an ice water bath
2. customremained below 26° C
3. extractionextracted with EtOAc (3×20 mL)
4. washThe extract was washed with water, Na2CO3 solution
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated