Trifluoroacetic acid → 6-Chloro-5-fluoro-4-iodopyridin-3-amine

Trifluoroacetic acid (50 mL) was added to a solution of (6-chloro-5-fluoro-4-iodo-pyridin-3-yl)-carbamic acid tert-butyl ester (31 g, 83.2 mmol) in dichloromethane (150 mL) and the resultant reaction mixture was stirred at ambient temperature for 90 minutes. The solvent was evaporated and the resultant residue was treated with ice/water (200 mL), layered with diethyl ether (300 mL) and the pH of the aqueous phase was adjusted to 10 by the addition of solid potassium carbonate solution. The organic phase was separated, dried (Na2SO4), filtered and concentrated in-vacuo to afford a residue. The resultant residue was triturated with pentane:diethyl ether (9:1) to afford the title compound as a cream coloured solid (22.3 g, 98%). 1H NMR (400 MHz, CDCl3): 7.63 (s, 1H).

1. customthe resultant reaction mixture
2. customThe solvent was evaporated
3. additionthe resultant residue was treated with ice/water (200 mL)
4. additionthe pH of the aqueous phase was adjusted to 10 by the addition of solid potassium carbonate solution
5. customThe organic phase was separated
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated in-vacuo
9. customto afford a residue
10. customThe resultant residue was triturated with pentane:diethyl ether (9:1)

ORD record

ord-c21d3077e8a44b0c99f20df48d641175

Source dataset

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09440976B2