Phosphorus sulfide (P2S5) → (R)-5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine

To a solution of (R)-5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-morpholin-3-one (10 g, 30.86 mmol) in CH2Cl2 (100 mL) was added P2S5 (6.86 g, 30.86 mmol) at room temperature. The resulted yellow suspension was heated to reflux for 6.5 h. The reaction mixture was filtered through a pad of silica gel (200˜300 mesh), washed with CH2Cl2 for 3 times to get a brown solution. The solvent was removed to provide the crude product as a yellow solid, which was dispersed in THF (10 mL), then 25% NH3 water solution (60 mL) was added at room temperature. 20 hours later, the reaction mixture was extracted with IPAC. The combined organic phase was washed with brine, dried over Na2SO4, filtered and concentrated to provide the title compound as a yellow solid.

1. temperatureThe resulted yellow suspension was heated
2. temperatureto reflux for 6.5 h
3. filtrationThe reaction mixture was filtered through a pad of silica gel (200˜300 mesh)
4. washwashed with CH2Cl2 for 3 times
5. customto get a brown solution
6. customThe solvent was removed
7. customto provide the crude product as a yellow solid, which
8. extraction20 hours later, the reaction mixture was extracted with IPAC
9. washThe combined organic phase was washed with brine
10. dry with materialdried over Na2SO4
11. filtrationfiltered
12. concentrationconcentrated

ORD record

ord-4360a20cd5be4990b7b760cd91ff3656

Source dataset

uspto-grants-2012_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08338413B1