Dichloromethane → 5-Bromo-2-(3-methoxyphenyl)pyridine

HRID 42013

Reaktionsgleichung

Reaktionsgleichung von HRID 42013
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([Br:8])=[CH:4][N:3]=1.[CH3:9][O:10][C:11]1[CH:12]=[C:13](B(O)O)[CH:14]=[CH:15][CH:16]=1.C(Cl)Cl.C([O-])([O-])=O.[Cs+].[Cs+]>O1CCOCC1.O>[Br:8][C:5]1[CH:6]=[CH:7][C:2]([C:15]2[CH:14]=[CH:13][CH:12]=[C:11]([O:10][CH3:9])[CH:16]=2)=[N:3][CH:4]=1.[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:15]2[CH:14]=[CH:13][CH:12]=[C:11]([O:10][CH3:9])[CH:16]=2)=[CH:4][N:3]=1

Komponenten

7

Edukt 4

HCID 6344DichloromethaneHCID 10796Cesium carbonateHCID 693532,5-DibromopyridineHCID 2734370(3-Methoxyphenyl)boronic acid

Produkt 2

HCID 153261552-Bromo-5-(3-methoxyphenyl)pyridineHCID 497585195-Bromo-2-(3-methoxyphenyl)pyridineAusbeute 43 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 218864351,4-Dioxane--water (1/1)Lösungsmittel

Versuchsvorschrift

In a schlenck tube, a mixture of 2,5-dibromopyridine (2.11 mmol, 0.500 g), 3-methoxyphenylboronic acid (2.11 mmol, 0.321 g), PdCl2dppf.DCM (0.21 mmol, 0.172 g), Cs2CO3 (6.33 mmol, 2.063 g) in a dioxane/water 4:1 mixture (14.5 ml) was heated at 100° C. for 14 hours, under argon atmosphere. The solvent was evaporated and the crude mixture was extracted between water and ethyl acetate. The solid residue was purified by chromatography over SiO2 eluting with hexane/ethyl acetate mixtures affording 5-bromo-2-(3-methoxyphenyl)pyridine (0.242 g, yield 43%) as major product and 2-bromo-5-(3-methoxyphenyl)pyridine (0.039 g) as minor product.

Aufarbeitung

  1. customThe solvent was evaporated
  2. extractionthe crude mixture was extracted between water and ethyl acetate
  3. customThe solid residue was purified by chromatography over SiO2 eluting with hexane/ethyl acetate

Quellen und Nachweise

ORD-Eintrag
ord-3d31eae132414104885a110c6a7d5294
Quelldatensatz
uspto-grants-2013_09
Patentnummer
US08536165B2

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