3-Fluoro-2-trifluoromethyl-pyridine-4-carbaldehyde oxime → 4-Pyridinemethanamine, 3-fluoro-2-(trifluoromethyl)-

Zinc dust (0.63 g, 9.62 mmol) was added at RT to a solution of 3-fluoro-2-trifluoromethyl-pyridine-4-carbaldehyde oxime (0.460 g, 1.57 mmol) in acetic acid (8 mL). The reaction mixture was stirred at RT for 3 h, then filtered through a 0.45 microns filter, and the filtrate was concentrated in vacuo. The colored oily residue was partitioned between CH2Cl2 and 1N HCl, the layers were separated and the aqueous phase was extracted twice with CH2Cl2. The pH of the aqueous layer was then adjusted to pH=9 by adding a saturated aqueous NaHCO3 solution, and the resulting white suspension was extracted four times with CH2Cl2. The combined organics were dried (phase separator) and concentrated in vacuo to afford the title compound as a yellow oil. MS (LC/MS): 195.0 [M+H]+; tR (HPLC conditions c): 2.47 min.

1. filtrationfiltered through a 0.45 microns
2. filtrationfilter
3. concentrationthe filtrate was concentrated in vacuo
4. customThe colored oily residue was partitioned between CH2Cl2 and 1N HCl
5. customthe layers were separated
6. extractionthe aqueous phase was extracted twice with CH2Cl2
7. additionby adding a saturated aqueous NaHCO3 solution
8. extractionthe resulting white suspension was extracted four times with CH2Cl2
9. customThe combined organics were dried (phase separator)
10. concentrationconcentrated in vacuo

ORD record

ord-23099a72d800404cb755d54f4a419377

Source dataset

uspto-grants-2015_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09085555B2