Ethyl Acetate → HCID 69427426, compound

HRID 1827998Notes

Reaction equation

HRID 1827998 reaction equation
Br[C:2]1[CH:3]=[CH:4][C:5]2[O:9][C:8]([C:10]([O:12][CH2:13]C)=[O:11])=[CH:7][C:6]=2[CH:15]=1.C(B(CC)[C:19]1[CH:20]=[N:21][CH:22]=[CH:23][CH:24]=1)C.P([O-])([O-])([O-])=O.[K+].[K+].[K+].C(OCC)(=O)C>CN(C=O)C.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>[CH3:13][O:12][C:10]([C:8]1[O:9][C:5]2[CH:4]=[CH:3][C:2]([C:19]3[CH:20]=[N:21][CH:22]=[CH:23][CH:24]=3)=[CH:15][C:6]=2[CH:7]=1)=[O:11]

Participants

7

Reactant 4

HCID 8857Ethyl AcetateHCID 62657Potassium Phosphate, TribasicHCID 6428513-(Diethylboryl)pyridineHCID 735184Ethyl (5-bromobenzofuran)-2-carboxylate

Product 1

HCID 69427426HCID 69427426, compoundYield 184.2%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 6228DimethylformamideSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of ethyl 5-bromo-benzofuran-2-carboxylate 15 (6 g, 22.3 mmole), diethyl 3-pyridylborane (3.66 g, 25 mmole), tetrakis(triphenylphosphine)palladium (0) (270 mg), and potassium phosphate (11.4 g, 53.7 mmole) in DMF (60 ml) was stirred under an argon atmosphere and heated to 100° C. for 16 hrs. The mixture was allowed to cool to room temperature, poured into ethyl acetate and washed with 10% HCl. The organic layer was washed with brine, dried, and evaporated to give 10.4 g of 5-pyridin-3-yl-benzofuran-2-carboxylic acid methyl ester. 534 mg the carboxylic ester were then dissolved in 11 ml t-butanol and stirred under nitrogen. Addition of 198 mg NaBH4 followed by 1.75 ml methanol and the reaction was stirred at 55° C. overnight. After cooling, the reaction was poured into brine and extracted with ethyl acetate. The organic layer was dried and evaporated. The residue was purified by chromatography to give 330 mg of (5-pyridin-3-yl-benzofuran-2-yl)-methanol 61.

Workup

  1. temperatureto cool to room temperature
  2. washwashed with 10% HCl
  3. washThe organic layer was washed with brine
  4. customdried
  5. customevaporated

Sources & evidence

ORD record
ord-e8cb1befd36843789b384c6508a939c1
Source dataset
uspto-grants-2006_06
Patent number
US07056903B2

Reaction notes

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