反应详情

n-BuLi (1.6 M in hexane, 6.24 mL) was added dropwise with stirring to a solution of nitropropane (0.9 mL, 10 mmol) in THF (12 mL) at -78° C. After 15 minutes a solution of TiCl3 (OPriso) (5 mmol) in THF (2 mL) and CH2Cl2 (3 mL) solution was added. After a further 15 minutes benzaldehyde (0.5 mL, 5 mmol) was added and the mixture allowed to warm up to room temperature (~ 30 min.). Stirring was continued for a further 3.5 hours at room temperature and the mixture was quenched with an aqueous slurry of disodium EDTA (1.86 g, 5 mmol) and extracted with Et2O (3×75 mL). The combined Et2O fractions were washed with dilute hydrochloric acid (2 M, 75 mL), aqueous sodium bicarbonate (75 mL) and water (75 mL), dried and evaporated in vacuo. Flash column chromatography (SiO2 , hexane:Et2O, 6:1 v.v] gave 1-phenyl-2-nitro-butan-1-ol (0.57 g, 61%) erythro:threo ratio 6:1.

1. extractionextracted with Et2O (3×75 mL)
2. washThe combined Et2O fractions were washed with dilute hydrochloric acid (2 M, 75 mL), aqueous sodium bicarbonate (75 mL) and water (75 mL)
3. customdried
4. customevaporated in vacuo