反应详情

The crude carboxylic acid of Example 7 (30.4 g, 100 mmol) and CDl (19.5 g, 120 mmol) were stirred in N,N-dimethylformamide (300 mL) at room temperature for 2 hours to obtain a yellow solution. To this solution was then added ammonium acetate (23.1 g, 300 mmol). The resulting mixture was stirred for 3 hours. It was then cooled in an ice-water bath and water (400 mL) was then added dropwise to the reaction mixture to obtain a fine white precipitation which was stirred for 12 hours. The solid was collected by vacuum filtration, washed with water and dried by suction (25.8 g, 85%): 1H NMR (DMSO-d6) δ1.75-1.90 (m, 1H), 2.00-2.15 (m, 1H), 2.55-2.80 (m, 2H), 4.43-4.47 (dd, J=8.7, 3.3 Hz, 1H), 6.65 (d, J=8.1 Hz, 1H), 7.35 (m, 2H). CI-MS m/z 304 (M +H+).

1. customto obtain a yellow solution
2. temperatureIt was then cooled in an ice-water bath
3. customto obtain
4. customa fine white precipitation which
5. stirringwas stirred for 12 hours
6. filtrationThe solid was collected by vacuum filtration
7. washwashed with water
8. customdried by suction (25.8 g, 85%)