Imidazole → 4-bromo-7-(1-(tert-butyldimethylsilyloxy)cyclopropyl)-9H-carbazole-1-carboxamide

HRID 661968Notes

Reaction equation

HRID 661968 reaction equation
[Br:1][C:2]1[C:14]2[C:13]3[C:8](=[CH:9][C:10]([C:15]4([OH:18])[CH2:17][CH2:16]4)=[CH:11][CH:12]=3)[NH:7][C:6]=2[C:5]([C:19]([NH2:21])=[O:20])=[CH:4][CH:3]=1.[C:22]([Si:26](Cl)([CH3:28])[CH3:27])([CH3:25])([CH3:24])[CH3:23].N1C=CN=C1>CN(C=O)C.CCOC(C)=O>[Br:1][C:2]1[C:14]2[C:13]3[C:8](=[CH:9][C:10]([C:15]4([O:18][Si:26]([C:22]([CH3:25])([CH3:24])[CH3:23])([CH3:28])[CH3:27])[CH2:17][CH2:16]4)=[CH:11][CH:12]=3)[NH:7][C:6]=2[C:5]([C:19]([NH2:21])=[O:20])=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 795Imidazole2×HCID 28928tert-Butyldimethylsilyl chloride2×HCID 666060564-bromo-7-(1-hydroxycyclopropyl)-9H-carbazole-1-carboxamide

Product 1

HCID 666056374-bromo-7-(1-(tert-butyldimethylsilyloxy)cyclopropyl)-9H-carbazole-1-carboxamideYield 71.9%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

Step 2 A solution of 4-bromo-7-(1-hydroxycyclopropyl)-9H-carbazole-1-carboxamide (0.151 g, 0.436 mmol), tert-butylchlorodimethylsilane (0.079 g, 0.524 mmol) and imidazole (0.074 g, 1.091 mmol) in DMF (2.2 mL) was stirred at rt for 18 h. Additional tert-butylchlorodimethylsilane (0.079 g, 0.524 mmol) and imidazole (0.074 g, 1.091 mmol) were added and stirring was continued for 1 h. The mixture was diluted with EtOAc (75 mL) and washed seven times with brine. The organic layer was dried and concentrated and the residue was purified by column chromatography (eluting with a gradient from 90:10 to 50:50 hexane-EtOAc) to give 4-bromo-7-(1-(tert-butyldimethylsilyloxy)cyclopropyl)-9H-carbazole-1-carboxamide (0.144 g, 67%).

Workup

  1. washwashed seven times with brine
  2. customThe organic layer was dried
  3. concentrationconcentrated
  4. customthe residue was purified by column chromatography (
  5. washeluting with a gradient from 90:10 to 50:50 hexane-EtOAc)

Sources & evidence

ORD record
ord-23859945c22d44de8979d9aee39cecf7
Source dataset
uspto-grants-2011_12
Patent number
US08084620B2

Reaction notes

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