Ethyl Acetoacetate → HCID 54262986, compound

HRID 1195344Notes

Reaction equation

HRID 1195344 reaction equation
[C:1]([O:7][CH2:8][CH3:9])(=[O:6])[CH2:2][C:3]([CH3:5])=[O:4].[H-].[Na+].[Li]CCCC.[F:17][C:18]1[CH:23]=[CH:22][C:21]([C:24]([C:36]2[CH:41]=[CH:40][C:39]([F:42])=[C:38]([CH3:43])[CH:37]=2)=[C:25]([C:30]2[N:34]([CH3:35])[N:33]=[N:32][N:31]=2)[CH:26]=[CH:27][CH:28]=[O:29])=[CH:20][C:19]=1[CH3:44]>O1CCCC1.CCCCCC>[F:17][C:18]1[CH:23]=[CH:22][C:21]([C:24]([C:36]2[CH:41]=[CH:40][C:39]([F:42])=[C:38]([CH3:43])[CH:37]=2)=[C:25]([C:30]2[N:34]([CH3:35])[N:33]=[N:32][N:31]=2)[CH:26]=[CH:27][CH:28]([OH:29])[CH2:5][C:3](=[O:4])[CH2:2][C:1]([O:7][CH2:8][CH3:9])=[O:6])=[CH:20][C:19]=1[CH3:44]

Participants

7

Reactant 4

HCID 8868Ethyl AcetoacetateHCID 24758Sodium hydrideHCID 53954728HCID 53954728, compoundHCID 178418339Butyllithium

Product 1

HCID 54262986HCID 54262986, compoundYield 48.7%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8058HexaneSolvent

Conditions

Temperature
-78 °C

Procedure

A solution of the dianion of ethyl acetoacetate (1.42 mL, 11.1 mmoles) in dry tetrahydrofuran (15 mL) was generated as described in Example 10 using 450 mg (11.3 mmoles) of NaH (60% in mineral oil) and 4.5 mL (11.1 mmoles) of 2.5M n-BuLi in hexane at 0° C. under argon. The orange dianion solution, after being chilled to -78° C., was transferred via a cannula into a tetrahydrofuran (15 mL) solution containing 5,5-bis(4-fluoro-3-methylphenyl)-4-(1-methyl-1H-tetrazol-5-yl)-2,4-pentadienal (2.12 g, 5.6 mmoles) at -78° C. The reaction mixture was stirred at -78° C. for 15 minutes. Analytical TLC eluted once with 50% (v/v) ethyl acetate in hexanes showed a major product at Rf =0.16. The reaction mixture was diluted with 20 mL of 1N HCl and the organic residues were extracted with ethyl acetate (30 mL×2). The organic layers were combined, dried over MgSO4 and concentrated under reduced pressure to give a pale syrup. The crude product was chromatographed on a silica gel column eluted with 35% (v/v) ethyl acetate in hexanes to give 1.39 g (48.7%) of the title compound. MS (CI): m/e=511 for (M+H)+.

Workup

  1. washAnalytical TLC eluted once with 50% (v/v) ethyl acetate in hexanes
  2. additionThe reaction mixture was diluted with 20 mL of 1N HCl
  3. extractionthe organic residues were extracted with ethyl acetate (30 mL×2)
  4. dry with materialdried over MgSO4
  5. concentrationconcentrated under reduced pressure
  6. customto give a pale syrup
  7. customThe crude product was chromatographed on a silica gel column
  8. washeluted with 35% (v/v) ethyl acetate in hexanes

Sources & evidence

ORD record
ord-fa0d9be412724f85b880ffb93a39e56c
Source dataset
uspto-grants-1992_05
Patent number
US05110940

Reaction notes

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