Potassium Phosphate, Tribasic → 4-Amino-3-nitro-6-(2-trifluoromethyl-phenyl)-pyridine-2-carbonitrile

HRID 570273Notes

Reaction equation

[NH2:1][C:2]1[CH:7]=[C:6](Cl)[N:5]=[C:4]([C:9]#[N:10])[C:3]=1[N+:11]([O-:13])=[O:12].[O-]P([O-])([O-])=O.[K+].[K+].[K+].[F:22][C:23]([F:34])([F:33])[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][C:25]=1B(O)O>O1CCOCC1.CCOC(C)=O.C(P(C(C)(C)C)[C-]1C=CC=C1)(C)(C)C.[C-]1(P(C(C)(C)C)C(C)(C)C)C=CC=C1.[Fe+2].CC([O-])=O.CC([O-])=O.[Pd+2]>[NH2:1][C:2]1[CH:7]=[C:6]([C:25]2[CH:26]=[CH:27][CH:28]=[CH:29][C:24]=2[C:23]([F:34])([F:33])[F:22])[N:5]=[C:4]([C:9]#[N:10])[C:3]=1[N+:11]([O-:13])=[O:12]

Participants

Conditions

Temperature: 80 °C

Procedure

A solution of 4-amino-6-chloro-3-nitro-pyridine-2-carbonitrile (186 mg, 0.937 mmol) in 1,4-dioxane (5 mL) was treated with K3PO4 (1.00 g, 5.10 mmol), 2-trifluoromethylphenylboronic acid (178 mg, 0.937 mmol), 1,1′-bis(di-tert-butylphosphino)ferrocene (60.5 mg, 0.128 mmol) and Pd(OAc)2 (28.6 mg, 0.128 mmol). The resulting mixture was stirred 80° C. overnight. The cooled mixture was diluted with EtOAc (50 mL) and washed with water (50 mL). The aqueous layer was extracted twice with EtOAc (30 mL) and the combined extracts were dried over MgSO4 and concentrated in vacuo. The resulting residue was purified on silica (0:100-100:0 EtOAc-hexanes) to yield 4-amino-3-nitro-6-(2-trifluoromethyl-phenyl)-pyridine-2-carbonitrile. 1H-NMR (400 MHz, CDCl3) δ: 7.79 (m, 1H), 7.67 (m, 4H), 7.52 (m, 1H), 7.04 (s, 1H).

Workup

washwashed with water (50 mL)
extractionThe aqueous layer was extracted twice with EtOAc (30 mL)
dry with materialthe combined extracts were dried over MgSO4
concentrationconcentrated in vacuo
customThe resulting residue was purified on silica (0:100-100:0 EtOAc-hexanes)

Sources & evidence

ORD record: ord-c60778d2bfbf49078e0dc35267179dc2
Source dataset: uspto-grants-2015_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09023846B2

Reaction notes

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