Triphenylphosphine → 5-Ethyl-2-[3-[2,6-dimethyl-4-(2-methyl-tetrazol-5-yl)-phenoxy]-propyl]furan

HRID 1377831

Reaction equation

HRID 1377831 reaction equation
N(C(OCC)=O)=NC(OCC)=O.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[CH2:32]([C:34]1[O:38][C:37]([CH2:39][CH2:40][CH2:41][OH:42])=[CH:36][CH:35]=1)[CH3:33].[CH3:43][N:44]1[N:48]=[N:47][C:46]([C:49]2[CH:54]=[C:53]([CH3:55])[C:52](O)=[C:51]([CH3:57])[CH:50]=2)=[N:45]1>O>[CH2:32]([C:34]1[O:38][C:37]([CH2:39][CH2:40][CH2:41][O:42][C:52]2[C:51]([CH3:57])=[CH:50][C:49]([C:46]3[N:47]=[N:48][N:44]([CH3:43])[N:45]=3)=[CH:54][C:53]=2[CH3:55])=[CH:36][CH:35]=1)[CH3:33]

Participants

6

Reactant 4

HCID 11776TriphenylphosphineHCID 148372Win 58768HCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 229154015-Ethyl-2-(3-hydroxypropyl)furan2×

Product 1

HCID 159546435-Ethyl-2-[3-[2,6-dimethyl-4-(2-methyl-tetrazol-5-yl)-phenoxy]-propyl]furanYield 65.4%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

Diethyl azodicarboxylate (DEAD, 4.84 g; 27.8 mmol) was added under nitrogen to a stirred and cooled (-20° C.) solution of triphenylphosphine (7.37 g; 27.8 mmol), 5-ethyl-2-(3-hydroxypropyl)furan (Intermediate 1c) (3.9 g; 25.3 mmol), and 4-(2-methyl-tetrazol-5-yl)-2,6-dimethylphenol (5.69 g; 27.8 mmol). The mixture was stirred at -20° C. for 1/2 h, and then was allowed to warm to room temperature overnight. Water (50 mL) was added to the mixture and the layers were separated. The aqueous layer was extracted with ether (3×50 mL), the organic layer was washed with 10% NaOH solution (3×50 mL), water, and dried over magnesium sulfate. The solvent was concentrated in vacuo to yield a residue and purified by MPLC column chromatography (ethyl acetate/hexane, 3:7) to afford 5.63 g (65%) of 5-ethyl-2-[3-[2,6-dimethyl-4-(2-methyl-tetrazol-5-yl)phenoxy]propyl]furan (Formula II; R3 =5-ethyl, R4 =hydrogen, R1,R2 =3,5-dimethyl, R5 =2-methyltetrazol-5-yl, Y=1,3-propylene).

Workup

  1. stirringThe mixture was stirred at -20° C. for 1/2 h
  2. customthe layers were separated
  3. extractionThe aqueous layer was extracted with ether (3×50 mL)
  4. washthe organic layer was washed with 10% NaOH solution (3×50 mL), water
  5. dry with materialdried over magnesium sulfate
  6. concentrationThe solvent was concentrated in vacuo
  7. customto yield a residue
  8. custompurified by MPLC column chromatography (ethyl acetate/hexane, 3:7)

Sources & evidence

ORD record
ord-5ab83aaac33e45579e689f23c6f4b675
Source dataset
uspto-grants-1997_09
Patent number
US05665763

Linked notes

Loading…