Iodoethane → HCID 86665237, compound

HRID 1028082Notes

Reaction equation

HRID 1028082 reaction equation
[CH2:1]([O:21][CH:22]([CH2:30][CH3:31])[C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:24])[CH2:2][CH2:3][CH2:4]/[CH:5]=[CH:6]\[CH2:7]/[CH:8]=[CH:9]\[CH2:10]/[CH:11]=[CH:12]\[CH2:13]/[CH:14]=[CH:15]\[CH2:16]/[CH:17]=[CH:18]\[CH2:19][CH3:20].[CH:32](NC(C)C)(C)[CH3:33].[Li].C(I)C.[NH4+].[Cl-]>O1CCCC1>[CH2:30]([C:22]([O:21][CH2:1][CH2:2][CH2:3][CH2:4]/[CH:5]=[CH:6]\[CH2:7]/[CH:8]=[CH:9]\[CH2:10]/[CH:11]=[CH:12]\[CH2:13]/[CH:14]=[CH:15]\[CH2:16]/[CH:17]=[CH:18]\[CH2:19][CH3:20])([CH2:32][CH3:33])[C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:24])[CH3:31]

Participants

6

Reactant 4

HCID 6340IodoethaneHCID 25517Ammonium ChlorideHCID 45051747Lithium diisopropylamineHCID 86665233HCID 86665233, compound

Product 1

HCID 86665237HCID 86665237, compoundYield 67.4%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

tert-Butyl 2-((5Z,8Z,11Z,14Z,17Z)-icosa-5,8,11,14,17-pentaen-1-yloxy)butanoate (480 mg, 1.11 mmol) was added dropwise over 30 minutes to a solution of lithium diisopropylamine (LDA) (2.0 M, 750 μL, 1.50 mmol) in dry tetrahydrofuran (10 mL) held at −70° C. under nitrogen. The reaction mixture was stirred for 30 minutes. Ethyl iodide (312 mg, 2.00 mmol) was added in one portion and the resulting mixture was warmed to ambient temperature during 1 hour. The reaction mixture was stirred at ambient temperature for 17 hours. The mixture was poured into saturated NH4Cl (aq.) (50 mL) and extracted with heptane (2×50 mL). The combined organic phases was washed succesively with brine (50 mL), 0.25 M HCl (50 mL) and brine (50 mL), dried (MgSO4), filtered and concentrated. The residue was purified by flash chromatography on silica gel using increasingly polar mixtures of heptane and ethyl acetate (100:0→95:5) as eluent. Concentration of the appropriate fractions afforded 343 mg (67% yield) of the title compound as an oil. 1H NMR (300 MHz, CDCl3): δ 0.84 (t, 6H), 0.99 (td, 3H), 1.35-1.55 (m, 11H), 1.54-1.69 (m, 2H), 1.68-1.87 (m, 4H), 1.99-2.24 (m, 4H), 2.74-2.99 (m, 8H), 3.31 (t, 2H), 5.23-5.52 (m, 10H); MS (electro spray): 401.3 [M−H]−

Workup

  1. customheld at −70° C. under nitrogen
  2. stirringThe reaction mixture was stirred at ambient temperature for 17 hours
  3. extractionextracted with heptane (2×50 mL)
  4. washThe combined organic phases was washed succesively with brine (50 mL), 0.25 M HCl (50 mL) and brine (50 mL)
  5. dry with materialdried (MgSO4)
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customThe residue was purified by flash chromatography on silica gel using
  9. temperatureincreasingly polar mixtures of heptane and ethyl acetate (100:0→95:5) as eluent

Sources & evidence

ORD record
ord-79e0ccf7f162444a82f88967888b3e20
Source dataset
uspto-grants-2014_05
Patent number
US08735436B2

Reaction notes

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