2-(tert-Butyldimethylsilyl)-N,N-dimethyl-1H-imidazole-1-sulfonamide → Rac-7-{[2-(tert-butyl-dimethyl-silanyl)-1-dimethylsulfamoyl-1h-imidazol-4-yl]-hydroxy-methyl}-5-methyl-benzofuran-2-carboxylic acid ethyl ester

HRID 1694794Notes

Reaction equation

HRID 1694794 reaction equation
[CH3:1][N:2]([CH3:18])[S:3]([N:6]1[CH:10]=[CH:9][N:8]=[C:7]1[Si:11]([C:14]([CH3:17])([CH3:16])[CH3:15])([CH3:13])[CH3:12])(=[O:5])=[O:4].[CH2:19]([O:21][C:22]([C:24]1[O:25][C:26]2[C:32]([CH:33]=[O:34])=[CH:31][C:30]([CH3:35])=[CH:29][C:27]=2[CH:28]=1)=[O:23])[CH3:20]>C1COCC1.CCCCCCC>[CH2:19]([O:21][C:22]([C:24]1[O:25][C:26]2[C:32]([CH:33]([C:9]3[N:8]=[C:7]([Si:11]([C:14]([CH3:15])([CH3:17])[CH3:16])([CH3:13])[CH3:12])[N:6]([S:3](=[O:4])(=[O:5])[N:2]([CH3:18])[CH3:1])[CH:10]=3)[OH:34])=[CH:31][C:30]([CH3:35])=[CH:29][C:27]=2[CH:28]=1)=[O:23])[CH3:20]

Participants

5

Reactant 2

HCID 64202092-(tert-Butyldimethylsilyl)-N,N-dimethyl-1H-imidazole-1-sulfonamideHCID 589519217-Formyl-5-methyl-benzofuran-2-carboxylic acid ethyl ester

Product 1

HCID 58951952Rac-7-{[2-(tert-butyl-dimethyl-silanyl)-1-dimethylsulfamoyl-1h-imidazol-4-yl]-hydroxy-methyl}-5-methyl-benzofuran-2-carboxylic acid ethyl ester

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8900HeptaneSolvent

Procedure

A solution of 2-(tert-butyl-dimethyl-silanyl)-imidazole-1-sulfonic acid dimethylamide (1.0 g) in THF (10 ml) was cooled under an Argon atmosphere to −78° C. n-Buthyllithium solution (1.6 M in heptane, 2.37 ml) were added dropwise. After stirring for 1 hr at −78° C. a solution of 7-formyl-5-methyl-benzofuran-2-carboxylic acid ethyl ester (963 mg) in THF (10 ml) was added dropwise. Stirring was continued for 15 min at −78° C., then the reaction mixture was warmed up to r.t. overnight. After quenching with water, the mixture was extracted with EtOAc. The organics were dried over MgSO4, filtrated and concentrated. The crude product was purified by column chromatography (silica gel; gradient: cyclohexane→cyclohexane/EtOAc 1:1) to give rac-7-{[2-(tert-butyl-dimethyl-silanyl)-1-dimethylsulfamoyl-1H-imidazol-4-yl]-hydroxy-methyl}-5-methyl-benzofuran-2-carboxylic acid ethyl ester as light yellow amorphous solid; MS (ISP): 522.3 ((M+H)+.).

Workup

  1. additionwere added dropwise
  2. additionwas added dropwise
  3. customAfter quenching with water
  4. extractionthe mixture was extracted with EtOAc
  5. dry with materialThe organics were dried over MgSO4
  6. filtrationfiltrated
  7. concentrationconcentrated
  8. customThe crude product was purified by column chromatography (silica gel; gradient: cyclohexane→cyclohexane/EtOAc 1:1)

Sources & evidence

ORD record
ord-928f8e0546c844bd81bca93d307fdc4f
Source dataset
uspto-grants-2012_04
Patent number
US08158668B2

Reaction notes

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