Potassium Fluoride → 4-(1H-Benzimidazol-2-yl)-6-[2-methylsulfanyl pyrimidin-4-yl]-2H-pyridazin-3-one

HRID 12290

Reaction equation

HRID 12290 reaction equation
Cl[C:2]1[CH:3]=[C:4]([C:17]2[N:21](COCC[Si](C)(C)C)[C:20]3[CH:30]=[CH:31][CH:32]=[CH:33][C:19]=3[N:18]=2)[C:5](=[O:16])[N:6](COCC[Si](C)(C)C)[N:7]=1.[CH3:34][S:35][C:36]1[N:41]=[C:40]([Sn](CCCC)(CCCC)CCCC)[CH:39]=[CH:38][N:37]=1.[F-].[K+]>[Cl-].C([N+](CC)(CC)CC)C.CN(C=O)C.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[NH:21]1[C:20]2[CH:30]=[CH:31][CH:32]=[CH:33][C:19]=2[N:18]=[C:17]1[C:4]1[C:5](=[O:16])[NH:6][N:7]=[C:2]([C:38]2[CH:39]=[CH:40][N:41]=[C:36]([S:35][CH3:34])[N:37]=2)[CH:3]=1

Participants

7

Reactant 3

HCID 522689Potassium FluorideHCID 27632612-(Methylthio)-4-(tributylstannyl)pyrimidineHCID 686802706-chloro-2-(2-trimethylsilanylethoxymethyl)-4-[1-(2-trimethylsilanyl-ethoxymethyl)-1H-benzimidazol-2-yl]-2H-pyridazin-3-one

Product 1

HCID 1359788044-(1H-Benzimidazol-2-yl)-6-[2-methylsulfanyl pyrimidin-4-yl]-2H-pyridazin-3-one

Reagents, catalysts & solvents 3

HCID 5946Tetraethylammonium ChlorideCatalystHCID 178418476HCID 178418476, compoundCatalystHCID 6228DimethylformamideSolvent

Conditions

Temperature
80 °C

Procedure

The compound is prepared in analogy to example 15. A Stille coupling is carried out instead of the Suzuki coupling. This entails dissolving 6-chloro-4-[1-(2-trimethylsilanylethoxymethyl)-1H-benzimidazol-2-yl]-2-(2-trimethylsilanylethoxy-methyl)-2H-pyridazin-3-one, 2-methylsulfanyl-4-tributylstannylpyrimidine, tetra-ethylammonium chloride and bis(triphenylphosphine)palladium(II) chloride in DMF under argon and heating at 80° C. for 6 hours. After cooling to room temperature, 30% aqueous potassium fluoride solution is added, and the mixture is stirred for 30 minutes. Extraction with ethyl acetate and drying on a drying column afford after purification on SiO2 4-[1-(2-trimethylsilanylethoxymethyl)-1H-benzimidazol-2-yl]-6-(2-methyisulfanylpyrimidin-4-yl)-2-(2-trimethylsilanylethoxymethyl)-2H-pyridazin-3-one which is reacted further in analogy to example 15.

Workup

  1. customThe compound is prepared in analogy to example 15
  2. temperatureAfter cooling to room temperature
  3. extractionExtraction with ethyl acetate
  4. customdrying on a drying column
  5. customafford
  6. customafter purification on SiO2 4-[1-(2-trimethylsilanylethoxymethyl)-1H-benzimidazol-2-yl]-6-(2-methyisulfanylpyrimidin-4-yl)-2-(2-trimethylsilanylethoxymethyl)-2H-pyridazin-3-one which
  7. customis reacted further in analogy to example 15

Sources & evidence

ORD record
ord-2c8b3ade3271450f9aea1bf3410a9b3b
Source dataset
uspto-grants-2010_06
Patent number
US07727989B2

Linked notes

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