Water → 5-Benzo[b]thiophen-2-yl-2,4-dimethoxy-benzaldehyde

HRID 10618

Reaction equation

HRID 10618 reaction equation
Br[C:2]1[C:3]([O:12][CH3:13])=[CH:4][C:5]([O:10][CH3:11])=[C:6]([CH:9]=1)[CH:7]=[O:8].[S:14]1[C:18](B(O)O)=[CH:17][C:16]2[CH:22]=[CH:23][CH:24]=[CH:25][C:15]1=2.C(=O)([O-])[O-].[Na+].[Na+].O>COCCOC.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[S:14]1[C:18]([C:2]2[C:3]([O:12][CH3:13])=[CH:4][C:5]([O:10][CH3:11])=[C:6]([CH:9]=2)[CH:7]=[O:8])=[CH:17][C:16]2[CH:22]=[CH:23][CH:24]=[CH:25][C:15]1=2

Participants

7

Reactant 4

HCID 962WaterHCID 2359Benzo(B)Thiophene-2-Boronic AcidHCID 10340Sodium CarbonateHCID 6683465-Bromo-2,4-dimethoxybenzaldehyde

Product 1

HCID 161159165-Benzo[b]thiophen-2-yl-2,4-dimethoxy-benzaldehydeYield 83%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 80711,2-DimethoxyethaneSolvent

Procedure

Ex-3A: A sample of 5-bromo-2,4-dimethoxybenzaldehyde (4.9 g, 20.0 mmol) was dissolved in ethylene glycol dimethyl ether (50 mL). Tetrakis(triphenylphosphine)palladium(0) (2.32 g, 2 mmol) was added, and the mixture was stirred at room temperature under nitrogen for 5 min. Benzo[b]thiophene-2-boronic acid (4.27 g, 24 mmol) and sodium carbonate solution (2 M, 20 mL) were added. The mixture was stirred at reflux under nitrogen for 24 hours. Upon cooling to room temperature, the mixture was poured into water and extracted with ethyl acetate. The organic phase was dried over sodium sulfate and evaporated. Silica gel chromatography (hexane/ethyl acetate 2:1 then 1:1) gave 4.75 g (83%) of the desired 5-(benzo[b]thien-2-yl)-2,4-dimethoxybenzaldehyde. 1H NMR (CDCl3) δ 10.36 (s, 1H), 8.20 (s, 1H), 7.83–7.78 (m, 2H), 7.68 (s, 1H), 7.36–7.27 (m, 2H), 6.54 (s, 1H), 4.06 (s, 3H), 4.00 (s, 3H).

Workup

  1. stirringThe mixture was stirred
  2. temperatureat reflux under nitrogen for 24 hours
  3. temperatureUpon cooling to room temperature
  4. extractionextracted with ethyl acetate
  5. dry with materialThe organic phase was dried over sodium sulfate
  6. customevaporated

Sources & evidence

ORD record
ord-c0e35e5b2743478c94c3b16684e200e4
Source dataset
uspto-grants-2006_08
Patent number
US07094801B2

Linked notes

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