反应详情

Step 1 A solution of 5-bromo-8-carbamoyl-2,3,4,9-tetrahydro-1H-carbazole-2-carboxylic acid (Intermediate 49-3, 2 g, 5.93 mmol) and TEA (2.067 mL, 14.83 mmol) in THF (20 mL) was treated with isobutyl chloroformate (0.810 g, 5.93 mmol) at 0° C. The mixture was stirred for 10 min, then was treated with a solution of N,O-dimethylhydroxylamine hydrochloric acid salt (0.579 g, 5.93 mmol) in THF (2 mL) and water (1 mL). The mixture was stirred at 0° C. for 1 h, then was diluted with DCM, washed with NaHCO3 (aq) and water, dried and concentrated. The residue was triturated with DCM to provide 5-bromo-N2-methoxy-N2-methyl-2,3,4,9-tetrahydro-1H-carbazole-2,8-dicarboxamide as a light yellow solid (1.73 g, 77%). Mass spectrum m/z 380, 382 (M+H)+.

1. stirringThe mixture was stirred at 0° C. for 1 h
2. washwashed with NaHCO3 (aq) and water
3. customdried
4. concentrationconcentrated
5. customThe residue was triturated with DCM