3,5-Dibromopyridine → 3-Bromo-5-(4-methoxyphenoxy)pyridine

HRID 2076392

Reaktionsgleichung

Reaktionsgleichung von HRID 2076392
Br[C:2]1[CH:3]=[N:4][CH:5]=[C:6]([Br:8])[CH:7]=1.[CH3:9][O:10][C:11]1[CH:32]=[CH:31][C:14]([O:15]C2C=C(N3CCC4(NCCC4)C3)C=NC=2)=[CH:13][CH:12]=1.COC1C=CC([O-])=CC=1.[Na+]>CN(C)C=O>[Br:8][C:6]1[CH:5]=[N:4][CH:3]=[C:2]([O:15][C:14]2[CH:31]=[CH:32][C:11]([O:10][CH3:9])=[CH:12][CH:13]=2)[CH:7]=1

Komponenten

5

Edukt 3

HCID 693693,5-Dibromopyridine2×HCID 22291247HCID 22291247, VerbindungHCID 23679016Sodium 4-methoxyphenolate

Produkt 1

HCID 120162263-Bromo-5-(4-methoxyphenoxy)pyridine

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228DimethylformamideLösungsmittel

Versuchsvorschrift

In an alternative approach to the synthesis of pyridine-substituted pyridyl diazaspiroalkanes, 3,5-dibromopyridine can be converted into the corresponding 5-alkoxy-3-bromo- and 5-aryloxy-3-bromopyridines by the action of sodium alkoxides or sodium aryloxides. Procedures such as those described by Comins et al., J. Org. Chem. 55: 69 (1990) and Hertog et al., Recueil Trav. Chim. Pays-Bas 74: 1171 (1955) are used. This is exemplified by the preparation of 7-(5-(4-methoxyphenoxy)-3-pyridyl)-1,7-diazaspiro[4.4]nonane. Reaction of 3,5-dibromopyridine with sodium 4-methoxyphenoxide in N,N-dimethylformamide gives 3-bromo-5-(4-methoxyphenoxy)pyridine. Coupling of 3-bromo-5-(4-methoxyphenoxy)pyridine with 1-benzyl-7-(3-pyridyl)-1,7-diazaspiro[4.4]nonane in the presence of sodium tert-butoxide, and a catalytic amount of tris(dibenzylideneacetone)dipalladium(0) and 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl, in toluene, followed by hydrogenolysis of the benzyl protecting group, will provide 7-(5-(4-methoxyphenoxy)-3-pyridyl)-1,7-diazaspiro[4.4]nonane.

Quellen und Nachweise

ORD-Eintrag
ord-1e5c838cc416448d8468986a3e122784
Quelldatensatz
uspto-grants-2011_04
Patentnummer
US07923559B2

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