反应详情

To a mixture of 25.03 g (103 mmol) of 8-chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-one in 200 mL of MeOH at room temperature and under a nitrogen atmosphere was added portionwise over a period of about 1 hour 4.82 g (124 mmol) of NaBH4. Occasional cooling with an ice bath was necessary at times during the addition in order to avoid excessive reflux. After 1.6 hours the mixture was poured into ice cold water and then extracted with EtOAc (3×). The combined organic portions were washed with brine, dried over MgSO4, filtered, and concentrated in vacuo. The residue was recrystallized from hot isopropyl ether. The remaining filtrate was purified via flash chromatography (20% EtOAc in hexanes) to yield more product which solidified on standing. Both batches were combined to yield 20.41 g of the title compound as a white solid.

1. temperatureOccasional cooling with an ice bath
2. additionwas necessary at times during the addition in order
3. additionAfter 1.6 hours the mixture was poured into ice cold water
4. extractionextracted with EtOAc (3×)
5. washThe combined organic portions were washed with brine
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue was recrystallized from hot isopropyl ether
10. customThe remaining filtrate was purified via flash chromatography (20% EtOAc in hexanes)
11. customto yield more product which