反应详情

温度

80 °C

To a solution of 2-(3-methoxy-phenyl)-2-methyl-propionic acid (D99) (1 g, 5.15 mmol, 1 equiv) in toluene (20 ml) at room temperature was added NEt3 (1.07 ml, 7.72 mmol, 1.5 equiv) and then diphenylphosphoryl azide (2.2 ml, 10.3 mmol, 2 equiv). The resulting mixture was then heated at 80° C. for 2 h then benzyl alcohol (1.61 ml, 15.45 mmol, 3 equiv) was added and the solution heated for a further 2 h, cooled to room temperature and partitioned between EtOAc and a saturated NaHCO3 aqueous solution. The two layers were separated and the aqueous phase dried over MgSO4 and concentrated. in vacuo. Purification of the residue by flash chromatography on silica gel (iso-hexane/AcOEt: 9/1) gave [1-(3-methoxy-phenyl)-1-methyl-ethyl]-carbamic acid benzyl ester (D100) (1 g, 65%) a yellow gum.

1. temperaturethe solution heated for a further 2 h
2. temperaturecooled to room temperature
3. custompartitioned between EtOAc
4. customThe two layers were separated
5. dry with materialthe aqueous phase dried over MgSO4
6. concentrationconcentrated
7. customPurification of the residue by flash chromatography on silica gel (iso-hexane/AcOEt: 9/1)