反应详情

To a solution of (S)-(−)-1-(1-naphthyl)ethylamine (20.8 g, 120 mmol) in acetonitrile (HPLC grade, 600 mL) is added K2CO3 (52.7 g, 360 mmol) and methyl 2,3-dibromopropionate (30 g, 120 mmol). The solution is stirred overnight at room temperature. The solution is evaporated to dryness, then H2O/EtOAc (1:1) (600 mL) is added, and the mixture is extracted with EtOAc (4×100 mL). The organic extracts are combined, dried and concentrated under vacuum. The residue is purified by flash chromatography (silica gel; Hexane/EtOAc 1:2) to provide 24 g (78%) of the title compound as a mixture of two diastereomers in an equimolecular ratio. M+H+=256.10.

1. customThe solution is evaporated to dryness
2. additionH2O/EtOAc (1:1) (600 mL) is added
3. extractionthe mixture is extracted with EtOAc (4×100 mL)
4. customdried
5. concentrationconcentrated under vacuum
6. customThe residue is purified by flash chromatography (silica gel; Hexane/EtOAc 1:2)