Potassium Phosphate, Tribasic → HCID 10776983, compound

HRID 1468138Notes

Reaction equation

HRID 1468138 reaction equation
Cl[C:2]1[CH:3]=[CH:4][C:5]([N+:9]([O-:11])=[O:10])=[C:6]([CH:8]=1)[NH2:7].[Cl:12][C:13]1[CH:18]=[CH:17][C:16](B(O)O)=[CH:15][CH:14]=1.[O-]P([O-])([O-])=O.[K+].[K+].[K+]>O1CCOCC1.O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[Cl:12][C:13]1[CH:18]=[CH:17][C:16]([C:3]2[CH:2]=[CH:8][C:6]([NH2:7])=[C:5]([N+:9]([O-:11])=[O:10])[CH:4]=2)=[CH:15][CH:14]=1

Participants

7

Reactant 3

HCID 62657Potassium Phosphate, TribasicHCID 742185-Chloro-2-nitroanilineHCID 742994-Chlorophenylboronic acid

Product 1

HCID 10776983HCID 10776983, compoundYield 69.4%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
95 °C

Procedure

To a solution of 5-chloro-2-nitroaniline (2 g, 11.59 mmol) in dioxane (100 ml) and water (10 ml) was added (4-chlorophenyl)boronic acid (3.6 g, 23.02 mmol), K3PO4 (5.01 g, 23.18 mmol) and Pd(PPh3)4 (0.7 g, 0.58 mmol) with stirring for 4 h at 95° C. maintained with an inert atmosphere of nitrogen. Then the resulting mixture was concentrated under vacuum to give a residue, which was purified by a silica gel column with 2% to 5% ethyl acetate in petroleum ether to afford 4-(4-chlorophenyl)-2-nitroaniline as a yellow solid (2.0 g, 69%). Next, to a solution of 5-(4-chlorophenyl)-2-nitroaniline (300 mg, 1.21 mmol) in ethanol (10 ml) was added hydrogen chloride (0.5 ml, 3.63 mmol) and Zn powder (800 mg, 12.3 mmol) in portions at room temperature and stirred for 2 h at 85° C. The resulting mixture was concentrated under vacuum to give a residue and dissolved in water (100 ml), adjusted to pH 8 with aqueous sodium bicarbonate. The mixture was extracted with ethyl acetate (3×100 ml) and dried and concentrated under vacuum to give a residue, which was purified by a silica gel column with 10% to 20% ethyl acetate in petroleum ether to produce 4-(4-chlorophenyl)benzene-1,2-diamine as an off-white solid (200 mg, 76%). Finally, a solution of 4-(4-chlorophenyl)benzene-1,2-diamine (150 mg, 0.69 mmol) in heptafluorobutanoic acid (2 ml) was stirred for 8 h at 120° C. Then the reaction was quenched with water (50 ml), adjusted to pH 7 with sodium bicarbonate and extracted with ethyl acetate(3×100 ml). The combined organic layers were dried over anhydrous magnesium sulfate and concentrated under vacuum to give a residue, which was purified by a silica gel column with 5% to 10% ethyl acetate in petroleum ether to produce 6-(4-chlorophenyl)-2-(heptafluoropropyl)-1H-1,3-benzodiazole as a white solid (49.5 mg, 18%).

Workup

  1. temperaturemaintained with an inert atmosphere of nitrogen
  2. concentrationThen the resulting mixture was concentrated under vacuum
  3. customto give a residue, which
  4. customwas purified by a silica gel column with 2% to 5% ethyl acetate in petroleum ether

Sources & evidence

ORD record
ord-baf3e3d59391401b8b2f6c7755fc3803
Source dataset
uspto-grants-2015_04
Patent number
US09000187B2

Reaction notes

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