反应详情

温度

0 °C

To a suspension of NaH (60% in mineral oil, 200 mg) in dry DMF (50 ml) at 0° C. was added the preceding pyridinone and the mixture was stirred at 0° C. for one half hour. To the resulting suspension was added 1-bromo-2-pentyne dropwise. The resulting mixture was kept at 0° C. during one half hour and poured into saturated aqueous ammonium chloride (200 ml). The aqueous suspension was extracted with ether (3×100 ml) and the combined ether layers washed with brine and dried, yielding the crude product. After column chromatography (silica gel, hexane:ethyl acetate 8:2) the product was obtained as a white amorphous solid.

1. waitThe resulting mixture was kept at 0° C. during one half hour
2. extractionThe aqueous suspension was extracted with ether (3×100 ml)
3. washthe combined ether layers washed with brine
4. customdried
5. customyielding the crude product