1-Bromo-2-methylpropane → HCID 69056941, compound

HRID 1865106Notes

Reaction equation

HRID 1865106 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[N:7]([CH3:26])[C:8]([CH2:24][CH3:25])=[C:9]([C:22]#[N:23])[C:10]=1[C:11]1[CH:16]=[CH:15][C:14]([C:17]2[NH:21][N:20]=[N:19][N:18]=2)=[CH:13][CH:12]=1)=[O:5])[CH3:2].[H-].[Na+].Br[CH2:30][CH:31]([CH3:33])[CH3:32]>CN(C=O)C.[Cl-].[Na+].O>[CH2:1]([O:3][C:4]([C:6]1[N:7]([CH3:26])[C:8]([CH2:24][CH3:25])=[C:9]([C:22]#[N:23])[C:10]=1[C:11]1[CH:12]=[CH:13][C:14]([C:17]2[N:18]([CH2:30][CH:31]([CH3:33])[CH3:32])[N:19]=[N:20][N:21]=2)=[CH:15][CH:16]=1)=[O:5])[CH3:2]

Participants

6

Reactant 3

HCID 65551-Bromo-2-methylpropaneHCID 24758Sodium hydrideHCID 178468489HCID 178468489, compound

Product 1

HCID 69056941HCID 69056941, compound

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 57417360Sodium chloride; waterSolvent

Conditions

Temperature
0 °C

Procedure

Into a round bottom flask containing a solution of 4-cyano-5-ethyl-1-methyl-3-[4-(1H-tetrazol-5-yl)-phenyl]-1H-pyrrole-2-carboxylic acid ethyl ester (0.150 g, 0.428 mmol, prepared in example E-242) in DMF (2 mL) cooled to 0° C. while stirring add NaH (0.019 g, 0.479 mmol, 60% in mineral oil). Let stir for 1 h, then add 1-bromo-2-methylpropane (0.052 mL, 0.479 mmol) and let stir overnight. Dilute the mixture with brine (20 mL) and extract the mixture with EtOAc (3×15 mL). Combine the organic layers and wash with brine (2×20 mL), aqueous NH4Cl (1×20 mL), aqueous NaHCO3 (1×20 mL) and water (1×20 mL). Dry the organic layer over anhydrous Na2SO4, filter, and concentrate under reduced pressure. Purify the residue via silica gel chromatography (eluent: 20 to 98% EtOAc in hexanes). Concentrate under reduced pressure the purified fractions and azeotroped with methylene chloride/hexanes. Place the residue under vacuum to provide the title compound as a colorless tar (0.011 g); mass spectrum (m/e): 407.3 (M+H)

Workup

  1. stirringLet stir for 1 h
  2. extractionextract the mixture with EtOAc (3×15 mL)
  3. washCombine the organic layers and wash with brine (2×20 mL), aqueous NH4Cl (1×20 mL), aqueous NaHCO3 (1×20 mL) and water (1×20 mL)
  4. dry with materialDry the organic layer over anhydrous Na2SO4
  5. filtrationfilter
  6. concentrationconcentrate under reduced pressure
  7. customPurify the residue via silica gel chromatography (eluent: 20 to 98% EtOAc in hexanes)
  8. concentrationConcentrate under reduced pressure the purified fractions
  9. customazeotroped with methylene chloride/hexanes

Sources & evidence

ORD record
ord-a09dd553be7b4d08b367a581d1cfb247
Source dataset
uspto-grants-2009_12
Patent number
US07625932B2

Reaction notes

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