Diisopropylamine → 3,5-difluoro-4-[1-hydroxy-3-(1-trityl-1H-imidazol-4-yl)-propyl]benzonitrile

HRID 76879

Reaction equation

HRID 76879 reaction equation
C(NC(C)C)(C)C.[Li]CCCC.[F:13][C:14]1[CH:15]=[C:16]([CH:19]=[C:20]([F:22])[CH:21]=1)[C:17]#[N:18].[C:23]([N:42]1[CH:46]=[C:45]([CH2:47][CH2:48][CH:49]=[O:50])[N:44]=[CH:43]1)([C:36]1[CH:41]=[CH:40][CH:39]=[CH:38][CH:37]=1)([C:30]1[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1)[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1>C1COCC1.CCOC(C)=O>[F:13][C:14]1[CH:15]=[C:16]([CH:19]=[C:20]([F:22])[C:21]=1[CH:49]([OH:50])[CH2:48][CH2:47][C:45]1[N:44]=[CH:43][N:42]([C:23]([C:36]2[CH:37]=[CH:38][CH:39]=[CH:40][CH:41]=2)([C:30]2[CH:31]=[CH:32][CH:33]=[CH:34][CH:35]=2)[C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)[CH:46]=1)[C:17]#[N:18]

Participants

7

Reactant 4

HCID 7912DiisopropylamineHCID 5872043,5-DifluorobenzonitrileHCID 114514283-(1-Tritylimidazol-4-YL) propionaldehydeHCID 178418339Butyllithium

Product 1

HCID 668855153,5-difluoro-4-[1-hydroxy-3-(1-trityl-1H-imidazol-4-yl)-propyl]benzonitrile

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent3×HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
-78 °C

Procedure

Diisopropylamine (0.53 mL, 3.75 mmol) is dissolved in 5 mL THF and cooled down to −78° C. To this is added n-BuLi (2.3 mL, 1.6M in hexanes). After 15 min, a solution of 3,5-difluorobenzonitrile (0.52 g, 3.75 mmol) and THF (5 mL) is added and the solution maintained at that temperature for 0.5 h before adding a solution of 3-(1-trityl-1H-imidazol-4-yl)propionaldehyde and THF (20 mL). After 2 h, the solution is diluted with EtOAc and quenched with saturated aqueous NH4Cl. The mixture is then partitioned between EtOAc and saturated aqueous NH4Cl. The organic is dried (Na2SO4) and evaporated. The residue is purified via flash column chromatography (EtOAc/hexanes 2:8→EtOAc) to give 3,5-difluoro-4-[1-hydroxy-3-(1-trityl-1H-imidazol-4-yl)-propyl]benzonitrile as a yellow powder. MS (ESI) m/z 506.2 (M+H).

Workup

  1. temperaturethe solution maintained at that temperature for 0.5 h
  2. waitAfter 2 h
  3. customquenched with saturated aqueous NH4Cl
  4. customThe mixture is then partitioned between EtOAc and saturated aqueous NH4Cl
  5. dry with materialThe organic is dried (Na2SO4)
  6. customevaporated
  7. customThe residue is purified via flash column chromatography (EtOAc/hexanes 2:8→EtOAc)

Sources & evidence

ORD record
ord-9e48427581204447a8ecfaad04250cfc
Source dataset
uspto-grants-2014_09
Patent number
US08835646B2

Linked notes

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