Potassium Permanganate → 5-(4-(4-Cyanophenyl)piperidine-1-carbonyl)-2-methylbenzoic acid

HRID 541213Notes

Reaction equation

[CH:1]([C:3]1[CH:4]=[C:5]([CH:22]=[CH:23][C:24]=1[CH3:25])[C:6]([N:8]1[CH2:13][CH2:12][CH:11]([C:14]2[CH:21]=[CH:20][C:17]([C:18]#[N:19])=[CH:16][CH:15]=2)[CH2:10][CH2:9]1)=[O:7])=[O:2].[O-:26][Mn](=O)(=O)=O.[K+]>C1COCC1.O>[C:18]([C:17]1[CH:16]=[CH:15][C:14]([CH:11]2[CH2:12][CH2:13][N:8]([C:6]([C:5]3[CH:22]=[CH:23][C:24]([CH3:25])=[C:3]([CH:4]=3)[C:1]([OH:26])=[O:2])=[O:7])[CH2:9][CH2:10]2)=[CH:21][CH:20]=1)#[N:19]

Participants

Conditions

Temperature: 60 °C

Procedure

To a stirred mixture of 4-(1-(3-formyl-4-methylbenzoyl)piperidin-4-yl)benzonitrile (compound 39.2, 600 mg, 1.81 mmol, 1.00 equiv) in THF (5 mL) was added dropwise a solution of KMnO4 (1 g) in water (10 mL). The resulting mixture was stirred overnight at 60° C. in an oil bath. After cooling to ambient temperature, the solids were removed by filtration and the pH of the filtrate was adjusted to ≧10 with sodium hydroxide (aqueous, 1 M). The resulting mixture was washed with 20 mL of ethyl acetate. Aqueous 1 M HCl was then employed to adjust the pH of the aqueous layer to ˜4. The resulting aqueous phase was extracted with 2×100 mL of ethyl acetate and the combined organic layers were dried over anhydrous sodium sulfate and concentrated under reduced pressure to yield 500 mg (80%) of the title compound as light yellow oil.

Workup

temperatureAfter cooling to ambient temperature
customthe solids were removed by filtration
washThe resulting mixture was washed with 20 mL of ethyl acetate
extractionThe resulting aqueous phase was extracted with 2×100 mL of ethyl acetate
dry with materialthe combined organic layers were dried over anhydrous sodium sulfate
concentrationconcentrated under reduced pressure

Sources & evidence

ORD record: ord-d78db4fd50eb494ba41e46b80d0ab06d
Source dataset: uspto-grants-2014_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08871790B2

Reaction notes

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