[NH2:1]O.[F:3][C:4]([F:19])([C:15]([F:18])([F:17])[F:16])[CH2:5][CH2:6][C:7]([C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][N:10]=1)=O.[OH-].[Na+]>CO.C(O)(C(F)(F)F)=O.[Zn]>[F:3][C:4]([F:19])([C:15]([F:18])([F:17])[F:16])[CH2:5][CH2:6][CH:7]([C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][N:10]=1)[NH2:1]
Hydroxylamine (0.216 mL, 3.53 mmol) was added to a solution of 4,4,5,5,5-pentafluoro-1-(pyridin-2-yl)pentan-1-one (0.894 g, 3.53 mmol) in MeOH (10.87 mL) and the resulting solution was stirred at 25° C. for 5 h. Another 1 eq. hydroxylamine was added and the reaction was stirred overnight. Another 2 eq hydroxylamine was added and the reaction was stirred overnight. The reaction mixture was concentrated in vacuo and the resulting residue was diluted with EtOAc and the resulting organic phase was washed with water and brine, then dried (Na2SO4) and concentrated in vacuo to give the crude oxime, as a colorless solid. This was redissolved in TFA (6.52 mL) and cooled to 0° C. Zinc (1.155 g, 17.66 mmol) was added in one portion. After 3 h at 0° C. the reaction mixture was poured into a mixture of ice and 5 N aq. NaOH. The pH was adjusted to pH 10. The mixture was extracted with DCM (3×). The combined organic extracts were dried (Na2SO4) and concentrated in vacuo to give the desired amine product. m/z=255.1 (M+H).
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