Sodium Hydroxide → 2-Chloro-6-(2-trifluoromethyl-phenyl)-pyridine-3,4-diamine

HRID 570246Notes

Reaction equation

[N+:1]([C:4]1[C:5]([NH2:20])=[CH:6][C:7]([C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][C:11]=2[C:16]([F:19])([F:18])[F:17])=[N:8][CH:9]=1)([O-])=O.O.O.[Cl:23][Sn]Cl.[OH-].[Na+]>Cl>[Cl:23][C:9]1[C:4]([NH2:1])=[C:5]([NH2:20])[CH:6]=[C:7]([C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][C:11]=2[C:16]([F:19])([F:18])[F:17])[N:8]=1

Participants

Conditions

Temperature: 90 °C

Procedure

5-Nitro-2-(2-trifluoromethyl-phenyl)-pyridin-4-ylamine (749 mg, 2.65 mmol, prepared as in the previous step) was dissolved in concentrated HCl (12 mL) and heated to 90° C. SnCl2.2H2O (2.98 g, 13.2 mmol) was added to the stirred mixture in small portions and resulting mixture was stirred at 90° C. for 1 h. After completion of addition, the resulting mixture was cooled to 0° C. in an ice bath, treated with 6 M aqueous NaOH (30 mL) and then extracted with DCM (3×40 mL). The combined extracts were dried over MgSO4 and filtered. The solvent was removed under reduced pressure and the residue was chromatographed on a 40-g SiO2 pre-packed column eluting with 0:1-3:2 EtOAc/hexanes to yield 2-chloro-6-(2-trifluoromethyl-phenyl)-pyridine-3,4-diamine. 1H-NMR (400 MHz, CDCl3) δ: 7.67 (d, J=7.8 Hz, 1H), 7.47-7.55 (m, 1H), 7.37-7.46 (m, 2H), 6.57 (s, 1H), 4.09 (br s., 2H), 3.74 (br. s., 2H).

Workup

customresulting mixture
additionAfter completion of addition
temperaturethe resulting mixture was cooled to 0° C. in an ice bath
extractionextracted with DCM (3×40 mL)
dry with materialThe combined extracts were dried over MgSO4
filtrationfiltered
customThe solvent was removed under reduced pressure
customthe residue was chromatographed on a 40-g SiO2 pre-packed column
washeluting with 0:1-3:2 EtOAc/hexanes

Sources & evidence

ORD record: ord-7f32d1d2651148faaca7b49b3ac00e40
Source dataset: uspto-grants-2015_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09023846B2

Reaction notes

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