Cesium carbonate → 6-(2-chloropyrimidin-4-yl)-2-(2-trimethylsilanylethoxymethyl)-4-[1-(2-trimethylsilanylethoxymethyl)-1H-benzimidazol-2-yl]-2H-pyridazin-3-one

HRID 12287

Reaction equation

HRID 12287 reaction equation
[O:1]=[C:2]1[N:7]([CH2:8][O:9][CH2:10][CH2:11][Si:12]([CH3:15])([CH3:14])[CH3:13])[N:6]=[C:5](B(O)O)[CH:4]=[C:3]1[C:19]1[N:23]([CH2:24][O:25][CH2:26][CH2:27][Si:28]([CH3:31])([CH3:30])[CH3:29])[C:22]2[CH:32]=[CH:33][CH:34]=[CH:35][C:21]=2[N:20]=1.[Cl:36][C:37]1[N:42]=[C:41](Cl)[CH:40]=[CH:39][N:38]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>O.O1CCOCC1>[Cl:36][C:37]1[N:42]=[C:41]([C:5]2[CH:4]=[C:3]([C:19]3[N:23]([CH2:24][O:25][CH2:26][CH2:27][Si:28]([CH3:31])([CH3:30])[CH3:29])[C:22]4[CH:32]=[CH:33][CH:34]=[CH:35][C:21]=4[N:20]=3)[C:2](=[O:1])[N:7]([CH2:8][O:9][CH2:10][CH2:11][Si:12]([CH3:15])([CH3:14])[CH3:13])[N:6]=2)[CH:40]=[CH:39][N:38]=1

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 775312,4-DichloropyrimidineHCID 686797026-oxo-1-(2-trimethylsilanylethoxymethyl)-5-[1-(2-trimethylsilanyl-ethoxymethyl)-1H-benzimidazol-2-yl]-1,6-dihydropyridazine-3-boronic acid

Product 1

HCID 866116106-(2-chloropyrimidin-4-yl)-2-(2-trimethylsilanylethoxymethyl)-4-[1-(2-trimethylsilanylethoxymethyl)-1H-benzimidazol-2-yl]-2H-pyridazin-3-one

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
97 °C

Procedure

1.32 g of 6-oxo-1-(2-trimethylsilanylethoxymethyl)-5-[1-(2-trimethylsilanylethoxy-methyl)-1H-benzimidazol-2-yl]-1,6-dihydropyridazine-3-boronic acid, 583 mg of 2,4-dichlorpyrimidine and 3,3 g of cesium carbonate are dissolved in 17 ml of a 1:4 mixture of water and dioxane, and argon is passed through the solution for degassing. After addition of 125 mg of (1,1′-bis(diphenyl-phosphine)ferrocene)palladium(II) chloride-dichloromethane complex, the solution is stirred at 97° C. for 3 hours. For workup, it is diluted with 50 ml of water and extracted several times with ethyl acetate. The combined organic phases are dried using a silica gel cartridge, and the solvent is distilled off. The crude product is purified by preparative RP-HPLC (0-100% acetonitrile in water (+0.01% trifluoroacetic acid)).

Workup

  1. customfor degassing
  2. additionAfter addition of 125 mg of (1,1′-bis(diphenyl-phosphine)ferrocene)palladium(II) chloride-dichloromethane complex
  3. additionFor workup, it is diluted with 50 ml of water
  4. extractionextracted several times with ethyl acetate
  5. customThe combined organic phases are dried
  6. distillationthe solvent is distilled off
  7. customThe crude product is purified by preparative RP-HPLC (0-100% acetonitrile in water (+0.01% trifluoroacetic acid))

Sources & evidence

ORD record
ord-4020a0a57845445b83289a2bc3d60e68
Source dataset
uspto-grants-2010_06
Patent number
US07727989B2

Linked notes

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