反应详情

To a suspension of (5-ethoxycarbonylpentyl)triphenylphosphonium bromide (3.0 g) in tetrahydrofuran (THF) (70 ml) was added dropwise, in nitrogen streams at -30° C., a hexane solution of n-butyl lithium (1.6M, 3.9 ml). The mixture was stirred for 30 minutes at the same temperature, to which was added dropwise at -30° C. a solution of 3-methoxy-4-[5-methyl-2-phenyl-4-oxazolylmethoxy)benzaldehyde (1.0 g) in tetrahydrofuran (THF) (10 ml). The mixture was stirred for 4 hours at temperature ranging from 50 to 60° C. The reaction mixture was then poured into water, which was subjected to extraction with ethyl acetate. The ethyl acetate layer was washed with water and dried (MgSO4), followed by distilling off the solvent under reduced pressure. The residue was subjected to column chromatography on silica gel. From the fraction eluted with ethyl acetate-hexane (1:4), was obtained ethyl 7-[3-methoxy-4-(5-methyl-2-phenyl-4-oxazolylmethoxy)phenyl]heptanoate (9.7 g, 85%) as an oily product.

1. additionwas added dropwise, in nitrogen streams at -30° C.
2. stirringThe mixture was stirred for 4 hours at temperature
3. customranging from 50 to 60° C
4. extractionwas subjected to extraction with ethyl acetate
5. washThe ethyl acetate layer was washed with water
6. dry with materialdried (MgSO4)
7. distillationby distilling off the solvent under reduced pressure
8. washFrom the fraction eluted with ethyl acetate-hexane (1:4)