3-Bromopyridine → 3-(4-Methyl-1H-imidazol-5-yl)pyridine

HRID 2055127Notes

Reaction equation

HRID 2055127 reaction equation
I[C:2]1[N:3]=[CH:4][N:5](C(C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[C:6]=1[CH3:7].C([Mg]Br)C.Br[C:32]1[CH:33]=[N:34][CH:35]=[CH:36][CH:37]=1>C1COCC1.[Cl-].[Zn+2].[Cl-].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>[CH3:7][C:6]1[NH:5][CH:4]=[N:3][C:2]=1[C:32]1[CH:33]=[N:34][CH:35]=[CH:36][CH:37]=1

Participants

7

Reactant 3

HCID 122863-BromopyridineHCID 235114374-Iodo-5-methyl-1-trityl-1H-imidazoleHCID 178418443HCID 178418443, compound

Product 1

HCID 235114243-(4-Methyl-1H-imidazol-5-yl)pyridineYield 92%

Reagents, catalysts & solvents 3

HCID 3007855ZincchlorideCatalystHCID 178418397HCID 178418397, compoundCatalystHCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 4-iodo-5-methyl-1-trityl-1H-imidazole (1 eq) in THF at room temperature was added ethylmagnesium bromide (1.2 eq) under dry conditions. After stirring for 90 minutes, zinc chloride (1.2 eq) was added to the reaction mixture. After stirring for another 90 minutes, tetrakis(triphenylphosphine)palladium (10%) and 3-bromopyridine (1.2 eq) were added to the reaction mixture. Subsequent reaction conditions were performed as in Example 73 to give 3-(5-methyl-1H-imidazol-4-yl)-pyridine (92%). MH+(160)

Workup

  1. stirringAfter stirring for another 90 minutes
  2. customSubsequent reaction conditions

Sources & evidence

ORD record
ord-ab939d0b85bc47e0956fbd3be1e00367
Source dataset
uspto-grants-2008_02
Patent number
US07332476B2

Reaction notes

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