1,2-Dimethoxyethane → 3-(2-Pyridyl)-5-(3-cyano-5-(4-pyridyl)phenyl)-1,2,4-oxadiazole

HRID 431923Notes

Reaction equation

HRID 431923 reaction equation
[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[C:7]1[N:11]=[C:10]([C:12]2[CH:17]=[C:16]([C:18]#[N:19])[CH:15]=[C:14](Br)[CH:13]=2)[O:9][N:8]=1.[N:21]1[CH:26]=[CH:25][C:24](B(O)O)=[CH:23][CH:22]=1.COCCOC.C(=O)([O-])[O-].[Na+].[Na+]>C(Cl)(Cl)Cl.[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[C:7]1[N:11]=[C:10]([C:12]2[CH:13]=[C:14]([C:24]3[CH:25]=[CH:26][N:21]=[CH:22][CH:23]=3)[CH:15]=[C:16]([C:18]#[N:19])[CH:17]=2)[O:9][N:8]=1

Participants

7

Reactant 4

HCID 80711,2-DimethoxyethaneHCID 10340Sodium CarbonateHCID 2734379(Pyridin-4-yl)boronic acidHCID 98804263-(2-Pyridyl)-5-(3-bromo-5-cyanophenyl)-1,2,4-oxadiazole

Product 1

HCID 99233223-(2-Pyridyl)-5-(3-cyano-5-(4-pyridyl)phenyl)-1,2,4-oxadiazoleYield 9%

Reagents, catalysts & solvents 2

HCID 11979704Tetrakis(triphenylphosphine)palladiumCatalystHCID 6212ChloroformSolvent

Procedure

A mixture of 3-(2-pyridyl)-5-(3-bromo-5-cyanophenyl)-1,2,4-oxadiazole (70 mg, 0.21 mmol), 4-pyridylboronic acid (53 mg, 0.43 mmol), and tetrakis(triphenylphosphine) palladium(0) (Pd(PPh3)4, 25 mg, 0.021 mmol) in a solution of ethylene glycol dimethyl ether (3 mL) and 2M sodium carbonate (3 mL) was headed in a sealed vial at 100° C. for 1 hour with vigorous stirring. The reaction was cooled and diluted with chloroform. The organic solution was washed with water and saturated brine, filtered, and concentrated. Silica gel chromatography of the residue using a gradient of 50% ethyl acetate in hexane to 100% ethyl acetate followed by trituration with 5% ethyl acetate in diethyl ether afforded 6 mg (9%) of 3-(2-pyridyl)-5-(3-cyano-5-(4-pyridyl)phenyl)-1,2,4-oxadiazole: 1H NMR (CDCl3): δ-8.88 (d, 1H), 8.78 (m, 3H), 8.64 (s, 1H), 8.26 (d, 1H), 8.15 (s, 1H), 7.93 (t, 1H), 7.61 (m, 2H), 7.52 (m, 1H).

Workup

  1. customsealed vial at 100° C.
  2. customfor 1 hour
  3. temperatureThe reaction was cooled
  4. washThe organic solution was washed with water and saturated brine
  5. filtrationfiltered
  6. concentrationconcentrated

Sources & evidence

ORD record
ord-23d98becbd51435797f8e855166d1c1d
Source dataset
uspto-grants-2003_12
Patent number
US06660753B2

Reaction notes

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