反应详情

to a solution of methyl 2-(benzylamino)-2-phenylacetate (4.818 g, 18.9 mmol) and pyridine (15.3 ml, 189 mmol) in 75 mL dichloromethane cooled by an ice bath was added 4-nitrobenzoyl chloride (3.50 g, 18.9 mmol) all at once. The cold bath was removed and the reaction stirred to room temperature. The reaction was stirred at room temperature for four hours then concentrated under reduced pressure, taken up in 100 mL heptane and concentrated under reduced pressure. The concentrate was partitioned between 100 mL dichloromethane and 100 mL water. The organic separation was washed with 50 mL brine then stirred over magnesium sulfate, filtered and the filtrate concentrated under reduced pressure to afford a colorless oil. The product was purified by chromatography on silica, eluting with 10-30% ethyl acetate in hexane to afford a colorless foamy solid (7.37 g, 96%). ESI+ m/z=405.1 [MH]+.

1. customThe cold bath was removed
2. stirringThe reaction was stirred at room temperature for four hours
3. concentrationthen concentrated under reduced pressure
4. concentrationconcentrated under reduced pressure
5. customThe concentrate was partitioned between 100 mL dichloromethane and 100 mL water
6. customThe organic separation
7. washwas washed with 50 mL brine
8. stirringthen stirred over magnesium sulfate
9. filtrationfiltered
10. concentrationthe filtrate concentrated under reduced pressure
11. customto afford a colorless oil
12. customThe product was purified by chromatography on silica
13. washeluting with 10-30% ethyl acetate in hexane