反应详情

温度

-45 °C

Alternative procedure: To a stirred solution of the oxazolo[4,5-b]pyridine (12 g, 100 mmol) in THF (300 ml) was added n-BuLi (1.6M solution in 62.5 ml of hexane) drop wise under N2 at −78° C. After 1 hour, MgBr.Et2O (25.8 g, 100 mmol) was added and the reaction mixture was allowed to warm to −45° C. for 1 hour before being treated with (S)-(1-formyl-propyl)-carbamic acid tert-butyl ester (11.46 g, 60 mmol) in THF (50 ml). The reaction mixture was stirred for 1 hour, quenched with saturated NH4Cl, and extracted with ethyl acetate. The organic layer was washed with brine, dried with MgSO4 and concentrated. The residue was purified by silica gel column chromatography to yield (S)-[1-(hydroxy-oxazolo[4,5-b]pyridin-2-yl-methyl)-propyl]-carbamic acid tert-butyl ester (14.1 g).

1. customquenched with saturated NH4Cl
2. extractionextracted with ethyl acetate
3. washThe organic layer was washed with brine
4. dry with materialdried with MgSO4
5. concentrationconcentrated
6. customThe residue was purified by silica gel column chromatography