反应详情

To a solution of 5-iodo-2-[2-(5-methyl-2-phenyl-4-oxazolyl)ethoxy]pyridine (2.5 g) in tetrahydrofuran (40 ml) was added dropwise, at -65° C. in nitrogen streams, a hexane solution of n-butyl lithium (1.6M, 4.61 ml). The mixture was stirred for 15 minutes at the same temperature, to which was added dropwise N,N-dimethylformamide (0.71 ml). The cooling bath was removed, and the reaction mixture was stirred for further 30 minutes, to which was added a saturated aqueous solution of ammonium chloride (6 ml). The reaction mixture was poured into water, which was subjected to extraction with ethyl acetate. The ethyl acetate layer was washed with water and dried (MgSO4), then the solvent was distilled off under reduced pressure to leave 5-formyl-2-[2-(5-methyl-2-phenyl-4-oxazolyl)ethoxy]pyridine (1.5 g, 79%), which was recrystallized from ethyl acetate--hexane to give colorless crystals, m.p.99°-100° C.

1. customThe cooling bath was removed
2. stirringthe reaction mixture was stirred for further 30 minutes, to which
3. additionwas added a saturated aqueous solution of ammonium chloride (6 ml)
4. additionThe reaction mixture was poured into water, which
5. extractionwas subjected to extraction with ethyl acetate
6. washThe ethyl acetate layer was washed with water
7. dry with materialdried (MgSO4)
8. distillationthe solvent was distilled off under reduced pressure