反应详情

To a solution of 61D (3.86 g, 11.3 mmol) in methanol:water (2:1, 50 mL) was added hydroxylamine HCl salt (3.0 g) followed by pyridine (5.0 mL). The reaction was stirred at rt for 18 h. Extract product into EtOAc, washing once with sat'd aqueous NaHCO3 and once with water. Back extract the aqueous washings with EtOAc and combine this with the initial extract. Dry organic extract over MgSO4, filter and concentrate. Dilute residue in toluene and remove solvent under vacuum to provide the title compound as a white solid (2.9 g). MS (ES) m/z 359.30 [M+H]+

1. washExtract product into EtOAc, washing once with sat'd aqueous NaHCO3 and once with water
2. extractionBack extract
3. washthe aqueous washings with EtOAc
4. extractioninitial extract
5. extractionDry organic extract over MgSO4
6. filtrationfilter
7. concentrationconcentrate
8. customDilute residue in toluene and remove solvent under vacuum