Sodium Carbonate → 4-Methyl-5-phenyl-1H-pyrrole-3-carbaldehyde

HRID 1962508Notes

Reaction equation

Br[C:2]1[N:6](S(C2C=CC=CC=2)(=O)=O)[CH:5]=[C:4]([CH:16]=[O:17])[C:3]=1[CH3:18].[C:19]1(B(O)O)[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.C(=O)([O-])[O-].[Na+].[Na+].[OH-].[Na+]>COCCOC.O>[CH3:18][C:3]1[C:4]([CH:16]=[O:17])=[CH:5][NH:6][C:2]=1[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1

Participants

Conditions

Temperature: 100 °C

Procedure

A suspension of 5-bromo-4-methyl-1-(phenylsulfonyl)-1H-pyrrole-3-carbaldehyde (1.78 g), phenylboronic acid (1.37 g), dichloro[bis(triphenylphosphine)]palladium (0.19 g) and sodium carbonate (1.72 g) in 1,2-dimethoxyethane (30 mL)-water (10 mL) was stirred at 100° C. for 1 hr. 8 mol/L aqueous sodium hydroxide solution (15 mL) was added, and the mixture was stirred at 90° C. for 3 hr. After cooling, the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane-ethyl acetate=9:1→1:1), and the obtained solid was washed with hexane to give the title compound as a pale-yellow solid (yield 815 mg, 69%).

Workup

stirringthe mixture was stirred at 90° C. for 3 hr
temperatureAfter cooling
extractionthe mixture was extracted with ethyl acetate
washThe extract was washed with saturated brine
dry with materialdried over anhydrous magnesium sulfate
concentrationconcentrated under reduced pressure
customThe residue was purified by silica gel column chromatography (eluent: hexane-ethyl acetate=9:1→1:1)
washthe obtained solid was washed with hexane

Sources & evidence

ORD record: ord-258f9f117bbe4f928038eb50b8937e2d
Source dataset: uspto-grants-2013_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08415368B2

Reaction notes

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