Triphenylphosphine → 6-((S)-2-Imidazol-1-yl-1-pyridin-3-yl-ethoxy)-5-nitro-3,4-dihydro-2H-naphthalen-1-one

HRID 496428Notes

Reaction equation

HRID 496428 reaction equation
[OH:1][C:2]1[C:3]([N+:13]([O-:15])=[O:14])=[C:4]2[C:9](=[CH:10][CH:11]=1)[C:8](=[O:12])[CH2:7][CH2:6][CH2:5]2.[N:16]1([CH2:21][C@@H:22]([C:24]2[CH:25]=[N:26][CH:27]=[CH:28][CH:29]=2)O)[CH:20]=[CH:19][N:18]=[CH:17]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CCOC(/N=N/C(OCC)=O)=O>C1COCC1>[N:16]1([CH2:21][C@H:22]([C:24]2[CH:25]=[N:26][CH:27]=[CH:28][CH:29]=2)[O:1][C:2]2[C:3]([N+:13]([O-:15])=[O:14])=[C:4]3[C:9](=[CH:10][CH:11]=2)[C:8](=[O:12])[CH2:7][CH2:6][CH2:5]3)[CH:20]=[CH:19][N:18]=[CH:17]1

Participants

6

Reactant 4

HCID 11776TriphenylphosphineHCID 5462977Diethyl azodicarboxylateHCID 123928306-Hydroxy-5-nitro-3,4-dihydronaphthalen-1(2H)-oneHCID 60029868(R)-2-imidazol-1-yl-1-pyridin-3-yl-ethanol

Product 1

HCID 697370746-((S)-2-Imidazol-1-yl-1-pyridin-3-yl-ethoxy)-5-nitro-3,4-dihydro-2H-naphthalen-1-oneYield 95%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 6-hydroxy-5-nitro-1-tetralone (0.957 g, 4.62 mmol) in dry THF (20 mL) was added (R)-2-imidazol-1-yl-1-pyridin-3-yl-ethanol (0.875 g, 4.62 mmol) followed by triphenylphospine (1.33 g, 5.08 mmol). After approximately 10 min, diethylazodicarboxylate (0.80 mL, 5.08 mmol) was added slowly. The reaction became homogenous. The reaction was allowed to stir at RT overnight. The reaction mixture was concentrated under reduced pressure and the residue was triturated with Et2O to remove some of the phospine by-products. The residue was dissolved in EtOAc and washed with H2O, saturated aqueous NaHCO3 and brine, dried over Na2SO4, and concentrated to give a foam/oil. Purification by chromatography (SiO2, 4-10% MeOH/CH2Cl2) afforded the title compound as a tan foam (1.66 g, 4.39 mmol, 95%). The structure was confirmed by NMR and mass spectrometry. MS m/z 379 (M++H).

Workup

  1. concentrationThe reaction mixture was concentrated under reduced pressure
  2. customthe residue was triturated with Et2O
  3. customto remove some of the phospine by-products
  4. dissolutionThe residue was dissolved in EtOAc
  5. washwashed with H2O, saturated aqueous NaHCO3 and brine
  6. dry with materialdried over Na2SO4
  7. concentrationconcentrated
  8. customto give a foam/oil
  9. customPurification by chromatography (SiO2, 4-10% MeOH/CH2Cl2)

Sources & evidence

ORD record
ord-dfe0a61e9e8b4e0f8544aa4efaa5eec3
Source dataset
uspto-grants-2005_09
Patent number
US06943183B2

Reaction notes

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