Citric Acid → 1-(biphenyl-4-ylmethyl)-1H-indole-7-carboxylic acid

HRID 1909883Notes

Reaction equation

[C:1]1([C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)[CH:6]=[CH:5][C:4]([CH2:7][N:8]2[C:16]3[C:11](=[CH:12][CH:13]=[CH:14][C:15]=3[C:17]([O:19]C)=[O:18])[CH:10]=[CH:9]2)=[CH:3][CH:2]=1.CO.[OH-].[Na+].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>C1COCC1>[C:1]1([C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)[CH:2]=[CH:3][C:4]([CH2:7][N:8]2[C:16]3[C:11](=[CH:12][CH:13]=[CH:14][C:15]=3[C:17]([OH:19])=[O:18])[CH:10]=[CH:9]2)=[CH:5][CH:6]=1

Participants

Conditions

Temperature: 60 °C

Procedure

To methyl 1-(biphenyl-4-ylmethyl)-1H-indole-7-carboxylate (2.5 g) were added methanol (20 mL), THF (20 mL), and a 1 M aqueous sodium hydroxide solution (10 mL), followed by stirring at 60° C. for 16 hours. To the reaction mixture was added a 10% aqueous citric acid solution (20 mL), followed by extraction with ethyl acetate, and the organic layer was washed with brine. After dehydration over anhydrous sodium sulfate, filtering and concentrating under reduced pressure, the obtained residue was added with diisopropylether, solidified, and collected by filtration. This solid was purified by silica gel column chromatography (chloroform/methanol=99/1-97/3) to obtain 1-(biphenyl-4-ylmethyl)-1H-indole-7-carboxylic acid (0.99 g).

Workup

extractionfollowed by extraction with ethyl acetate
washthe organic layer was washed with brine
filtrationAfter dehydration over anhydrous sodium sulfate, filtering
concentrationconcentrating under reduced pressure
additionthe obtained residue was added with diisopropylether
filtrationcollected by filtration
customThis solid was purified by silica gel column chromatography (chloroform/methanol=99/1-97/3)

Sources & evidence

ORD record: ord-c8ac8899574346d4910799310c63a32d
Source dataset: uspto-grants-2013_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08598355B2

Reaction notes

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