Triphosgene → Tert-butyl (1-(4'-fluoro-4-nitrobiphenyl-3-ylcarbamoyl)azetidin-3-yl)methylcarbamate

To a solution of 4′-fluoro-4-nitro-[1,1′-biphenyl]-3-amine (1.5 g, 6.46 mmol) in DCM (50 mL) were added triphosgene (1.917 g, 6.46 mmol) and TEA (8.5 g, 84 mmol) at 0° C. The reaction mixture was stirred at room temperature for two hours. tert-butyl azetidin-3-ylmethylcarbamate (1.203 g, 6.46 mmol) was then added at 0° C. and the reaction mixture was stirred at room temperature for four hours. The reaction crude was diluted with saturated citric acid solution and extracted with DCM. The organic layer was washed with water, brine, dried over Na2SO4, filtered and concentrated to yield crude residue which was purified by column chromatography eluting with 30% EtOAc in Hexane to afford tert-butyl((1-((4′-fluoro-4-nitro-[1,1′-biphenyl]-3-yl)carbamoyl)azetidin-3-yl)methyl)carbamate (2 g, 69.7% yield).

1. stirringthe reaction mixture was stirred at room temperature for four hours
2. customThe reaction crude
3. extractionextracted with DCM
4. washThe organic layer was washed with water, brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated
8. customto yield crude residue which
9. customwas purified by column chromatography
10. washeluting with 30% EtOAc in Hexane

ORD-Eintrag

ord-803b27dd5bef424dae76ae18aee9c735

Quelldatensatz

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09447030B2