反应详情

3-Bromo-5-(4-fluorophenyl)-4-(pyridin-4-yl)pyrazole (3.18 g (10 mmol), prepared as described in 1)) was dissolved in tetrahydrofuran (32 ml). To the solution was added a solution of 1.6 M butyl lithium/hexane (13.75 ml, 13.75 mmol) at −78° C., and the resulting mixture was stirred for 10 minutes. To the mixture was added 1,2,3,5,6,7,8,8a-octahydroindolizin-7-one (1.53 g, 11 mmol) at −78° C., and the resulting mixture was stirred first at −78° C. for 2 hours, then at room temperature for 1 hour. At the end of this time, the reaction mixture was added to a saturated aqueous solution of sodium hydrogencarbonate and extracted with ethyl acetate. The organic layer was washed with water, dried over anhydrous sodium sulfate and the solvent was removed by distillation under reduced pressure. The residue was purified by column chromatography through silica gel (eluent, ethyl acetate:methanol:isopropylamine=20:1:1), to give the title compound (830 mg) as a pale yellow powder (yield 22%).

1. stirringthe resulting mixture was stirred first at −78° C. for 2 hours
2. waitat room temperature for 1 hour
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed with water
5. dry with materialdried over anhydrous sodium sulfate
6. customthe solvent was removed by distillation under reduced pressure
7. customThe residue was purified by column chromatography through silica gel (eluent, ethyl acetate:methanol:isopropylamine=20:1:1)