Lithium borohydride → 1-{3-Amino-2-[(2,2-difluoro-3-hydroxypropyl)amino]phenyl}-3-(2,4-dichlorophenyl)thiourea

Temperature

0 °C

To a solution of ethyl 3-[(2-amino-6-{[(2,4-dichlorophenyl)carbamothioyl]amino}phenyl)amino]-2,2-difluoropropanoate (694.5 mg, 1.50 mmol) in tetrahydrofuran (10 mL) was added lithium tetrahydroborate (65.3 mg, 3.00 mmol) at 0° C. The mixture was stirred at 0° C. for 30 min. The reaction mixture was quenched with H2O. The mixture was extracted with ethyl acetate (×3). The combined organic layer was washed with brine (×1), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with a 0-50% ethyl acetate/n-hexane gradient mixture to give a title compound (70.0 mg) and a mixture contained the title compound. The mixture was purified by preparative HPLC to give the title compound as the trifluoroacetic acid salt. The salt was neutralized with aqueous saturated sodium hydrogen carbonate and extracted with ethyl acetate. The extract was washed with brine, dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo to give the title compound as a colorless amorphous (273.3 mg). Total amount was 343.3 mg (0.815 mmol, 54%).

1. customThe reaction mixture was quenched with H2O
2. extractionThe mixture was extracted with ethyl acetate (×3)
3. washThe combined organic layer was washed with brine (×1)
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by silica gel column chromatography
8. washeluting with a 0-50% ethyl acetate/n-hexane gradient mixture

ORD record

ord-c7535583488d4fc1bdf49e555dd243ab

Source dataset

uspto-grants-2014_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08901141B2