反应详情

A solution of the N-methylmorpholine-N-oxide (13.6 g) in acetonitrile (135 ml) containing 3 Å molecular sieves (13.2 g) was stirred at room temperature overnight and cooled in ice. A solution of 4-bromomethyl-5-fluorobenzofuran and 6-bromomethyl-5-fluorobenzofuran (13.33 g) in acetonitrile (35 ml) was added and the mixture stirred at 5° for 4 h. The mixture was filtered and the filtrate evaporated to dryness. Water and ethyl acetate were added to the residue and the organic phase separated, dried and evaporated to give the mixture of aldehydes. The mixture was separated by chromatography on silica (600 g) using a mixture of ethyl acetate and hexane (1:9) as the eluant to give the title compound (A) (2.19 g);

1. temperaturecooled in ice
2. stirringthe mixture stirred at 5° for 4 h
3. filtrationThe mixture was filtered
4. customthe filtrate evaporated to dryness
5. additionWater and ethyl acetate were added to the residue
6. customthe organic phase separated
7. customdried
8. customevaporated
9. customto give
10. customThe mixture was separated by chromatography on silica (600 g)
11. additiona mixture of ethyl acetate and hexane (1:9) as the eluant