反应详情

To a solution of NaH (60% oil dispersion, 2.4 g, 0.06 mol) in DMF (50 ml) heated at 60° C. with stirring under N2 was added dropwise a solution of 5-(2-hydroxyethyl)benzo[b]thiophene (8.9 g, 0.05 mol) in DMF (50 ml). After 1/2 hour, a solution of benzyl bromide (10.3 g, 7.2 ml, d=1.438, 0.06 mol) in DMF (50 ml) was added dropwise. After 15 hours, the solution was poured into H2O and the aqueous phase extracted with ethyl acetate (3×). The organic layers were backwashed with H2O saturated NaCl, dried, filtered and concentrated to dryness. The residue was chromatographed on silica gel and the product was eluted with 10% (V/V) ethyl acetate-hexane to yield 9.7 g (72%) of product. The material was used directly in the next step without further purification.

1. waitAfter 15 hours
2. extractionthe aqueous phase extracted with ethyl acetate (3×)
3. customdried
4. filtrationfiltered
5. concentrationconcentrated to dryness
6. customThe residue was chromatographed on silica gel
7. washthe product was eluted with 10% (V/V) ethyl acetate-hexane