反应详情

A solution of 3-chloro-6,7-difluorobenzo[d]isoxazole-5-carbaldehyde (Intermediate 532, 3.32 g, 10.6 mmol), (2R,6R)-2,6-dimethylmorpholine (Purchased from BASF®, 2.64 g, 22.9 mmol) and DIEA (4 ml, 22.9 mmol) in acetonitrile (20 ml) was heated at reflux for 3 hours. The mixture was cooled to room temperature before being partitioned between EtOAc and 1N HCl. The EtOAc was separated and washed with brine. The combined aqueous layers were extracted with EtOAc, which was washed with brine. The combined EtOAc was dried (MgSO4) and concentrated to give an oil that was chromatographed on silica gel (50% hexanes in CH2Cl2 followed by gradient elution to 100% CH2Cl2 followed by gradient elution to 5% EtOAc in CH2Cl2) to give 2 materials in order of elution: the first material (265 mg) is consistent with starting material and the second (3.33 g) with desired product.

1. temperatureat reflux for 3 hours
2. custombefore being partitioned between EtOAc and 1N HCl
3. customThe EtOAc was separated
4. washwashed with brine
5. extractionThe combined aqueous layers were extracted with EtOAc, which
6. washwas washed with brine
7. dry with materialThe combined EtOAc was dried (MgSO4)
8. concentrationconcentrated
9. customto give an oil that
10. customwas chromatographed on silica gel (50% hexanes in CH2Cl2 followed by gradient elution to 100% CH2Cl2 followed by gradient elution to 5% EtOAc in CH2Cl2)
11. customto give 2 materials
12. washin order of elution