Reaction equation
C([O:3][C:4](=O)[C:5]1[CH:10]=[C:9]([O:11][CH2:12][CH3:13])[C:8]([N:14]2[CH:18]=[CH:17][CH:16]=[CH:15]2)=[C:7]([O:19][CH2:20][CH3:21])[CH:6]=1)C.[H-].C([Al+]CC(C)C)C(C)C>C1(C)C=CC=CC=1>[CH2:20]([O:19][C:7]1[CH:6]=[C:5]([CH2:4][OH:3])[CH:10]=[C:9]([O:11][CH2:12][CH3:13])[C:8]=1[N:14]1[CH:15]=[CH:16][CH:17]=[CH:18]1)[CH3:21]Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
To a solution of 3,5-diethoxy-4-pyrrol-1-yl-benzoic acid ethyl ester (1.51 g, 4.98 mmol) in toluene (5 mL) was added slowly over a time period of 15 min under slight cooling to 20° C. a solution of diisobutylaluminium hydride (8.9 mL, 12.45 mmol, 20% solution in toluene). After 1 h, the excess hydride was quenched by cautious addition of water (10 mL) and a 28% solution of sodium hydoxide (2 mL). The mixture was stirred for 30 min and the organic phase filtered over Hyflo. The aqueous layer was extracted with toluene (2×50 mL), the combined organic phases washed with a sat. solution of sodium chloride (2×50 mL) and concentrated by evaporation under reduced pressure to afford 1.30 g (100%) of (3,5-diethoxy-4-pyrrol-1-yl-phenyl)-methanol. The crude alcohol (1.30 g, 4.98 mmol, 1.0 equiv) was dissolved in toluene (20 mL) and MnO2 (7.79 g, 89.5 mmol, 18.0 equiv) was added. The reaction mixture was heated to reflux for 7 h, after which time the reaction was filtered through Hyflo and concentrated yielding 1.15 g (89% yield) of the title compound.
Workup
- customthe excess hydride was quenched by cautious addition of water (10 mL)
- filtrationthe organic phase filtered over Hyflo
- extractionThe aqueous layer was extracted with toluene (2×50 mL)
- washthe combined organic phases washed with a sat. solution of sodium chloride (2×50 mL)
- concentrationconcentrated by evaporation under reduced pressure
Sources & evidence
- ORD record
- ord-5dc572e3304648388b9b5c1bc66aff34
- Source dataset
- uspto-grants-2010_08
- Patent number
- US07772253B2
Linked notes
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