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. under nitrogen streams, a hexane solution of n-butyllithium (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, then 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, followed by extraction with ethyl acetate. The ethyl acetate 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%). Recrystallization from ethyl acetate-hexane gave 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
5. extractionfollowed by extraction with ethyl acetate
6. washThe ethyl acetate was washed with water
7. dry with materialdried (MgSO4)
8. distillationthe solvent was distilled off under reduced pressure