反应详情

A mixture of ethyl 5-chloromethylbenzofuran-2-carboxylate (3.0 g, 0.0126 mol), sodium cyanide (1.23 g, 0.025 mol), tetrabutylammonium bromide (0.50 g, 0.0013 mol), water (10 cm3) and dichloromethane (10 cm3) was vigorously stirred for 18 hr. at room temperature. The mixture was separated and the organic layer was washed with water, dried (Na2SO4), filtered and the solvent was removed. The residue was recrystallised from petroleum ether (b.p. 60°-80° C.) to give ethyl 5-cyanomethylbenzofuran-2-carboxylate (1.92 g, 0.0084 mol, 66.6%) m.p. 76°-77° C.-t.l.c./silica/toluene, RF 0.11.

1. customat room temperature
2. customThe mixture was separated
3. washthe organic layer was washed with water
4. dry with materialdried (Na2SO4)
5. filtrationfiltered
6. customthe solvent was removed
7. customThe residue was recrystallised from petroleum ether (b.p. 60°-80° C.)