反应详情

温度

100 °C

To a stirred solution of methyl 6-bromo-1-cyclopentyl-1H-indazole-4-carboxylate (5 g, 15.527 mmol) in DMSO (25 mL), 1-Boc piperazine (4.3 g, 23.3 mmol), K2CO3 (4.28 g, 31.05 mmol), CuI (0.295 g, 1.55 mmol) and L-proline (0.357 g, 3.1 mmol) were added in given order and resulting reaction mixture heated to 100° C. for 48 h. On completion, the reaction mixture was poured into water and extracted with DCM. The combined organic layers were washed with water and dried over sodium sulfate. The solvent was removed under reduced pressure to obtain crude residue which was purified by column chromatography over silica gel affording methyl 6-(4-(tert-butoxycarbonyl)piperazin-1-yl)-1-cyclopentyl-1H-indazole-4-carboxylate (2 g, 30%).

1. customresulting
2. customreaction mixture
3. extractionextracted with DCM
4. washThe combined organic layers were washed with water
5. dry with materialdried over sodium sulfate
6. customThe solvent was removed under reduced pressure
7. customto obtain crude residue which
8. customwas purified by column chromatography over silica gel