反应详情

To a solution of lithium borohydride (2.61 g) in tetrahydrofuran (60 mL) was added a solution of 1-[7-(4-bromo-2,6-dimethylphenyl)-2,5-dimethyl-6-oxo-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl]piperidine-4-carboxylic acid ethyl ester (6.0 g) in a mixture of tetrahydrofuran (60 mL) and methanol (3 mL) dropwise over 10 minutes under ice-cooling. The reaction mixture was warmed up to room temperature and stirred for 3 hours. After cooling with an ice-bath, 6 M HCl aqueous solution (30 mL) was added and stirred at room temperature for 1 hour. The solution was made to alkaline (pH=9) with 6 M NaOH aqueous solution, and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated under reduced pressure and the residue was purified by a silica gel column chromatography (silica gel: Wako Gel (C200), eluent: hexane/ethyl acetate=1:1) to give {1-[7-(4-bromo-2,6-dimethylphenyl)-2,5-dimethyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl]piperidin-4-yl}methanol (4.6 g).

1. temperaturecooling
2. temperatureAfter cooling with an ice-bath
3. stirringstirred at room temperature for 1 hour
4. extractionextracted with ethyl acetate
5. washThe organic layer was washed with brine
6. dry with materialdried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationThe filtrate was concentrated under reduced pressure
9. customthe residue was purified by a silica gel column chromatography (silica gel: Wako Gel (C200), eluent: hexane/ethyl acetate=1:1)