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温度

0 °C

Boron trifluoride (30.8 mL, 244 mmol) is added to a −50° C. solution of benzyl 3,3a,4,6-tetrahydropyrrolo[3,4-c]isoxazole-5-carboxylate (40 g, 162 mmol) in tetrahydrofuran (200 mL). The mixture is stirred for 10 minutes and the solution is added to phenyl magnesium bromide (325 mL, 325 mmol, 1 M in tetrahydrofuran) at −50° C., warmed to 0° C., and stirred for 4 hours. The reaction is quenched with saturated ammonium chloride (200 mL) and the aqueous layer is separated. The organic layer is dried over magnesium sulfate and the solvent is removed under vacuum. The crude product is purified over silica gel using a 5 to 50% ethyl acetate/hexanes gradient to give the title compound (31 g, 59%). ES/MS (m/e): 325 (M+H).

1. stirringstirred for 4 hours
2. customThe reaction is quenched with saturated ammonium chloride (200 mL)
3. customthe aqueous layer is separated
4. dry with materialThe organic layer is dried over magnesium sulfate
5. customthe solvent is removed under vacuum
6. customThe crude product is purified over silica gel using a 5 to 50% ethyl acetate/hexanes gradient