Citric Acid → 2-propargyloxy-4-(N-t-butyloxycarbonyl-4-piperidinyloxy)benzoic acid

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Reaktionsgleichung

[CH2:1]([O:4][C:5]1[CH:14]=[C:13]([O:15][CH:16]2[CH2:21][CH2:20][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:18][CH2:17]2)[CH:12]=[CH:11][C:6]=1[C:7]([O:9]C)=[O:8])[C:2]#[CH:3].[OH-].[Na+].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>CO>[CH2:1]([O:4][C:5]1[CH:14]=[C:13]([O:15][CH:16]2[CH2:21][CH2:20][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:18][CH2:17]2)[CH:12]=[CH:11][C:6]=1[C:7]([OH:9])=[O:8])[C:2]#[CH:3]

Komponenten

Reaktionsbedingungen

Temperatur: 50 °C

Versuchsvorschrift

Methyl 2-propargyloxy-4-(N-t-butyloxycarbonyl-4-piperidinyloxy)benzoate (467 mg, 1.2 mmol) from Step 1 above was dissolved in methanol (10 mL) and to the stirred solution was added 1N NaOH (2.4 mL). The reaction was stirred for 4 h at 50° C. The cooled reaction was acidified with 5% aqueous citric acid (25 mL). The methanol was removed under reduced pressure and the remaining aqueous was extracted with methylene chloride (4×50 mL). The combined organic extracts were washed with water and brine, dried over magnesium sulfate and filtered. The solvent was removed under reduced pressure to give 2-propargyloxy-4-(N-t-butyloxycarbonyl-4-piperidinyloxy)benzoic acid.

Aufarbeitung

customThe cooled reaction
customThe methanol was removed under reduced pressure
extractionthe remaining aqueous was extracted with methylene chloride (4×50 mL)
washThe combined organic extracts were washed with water and brine
dry with materialdried over magnesium sulfate
filtrationfiltered
customThe solvent was removed under reduced pressure

Quellen und Nachweise

ORD-Eintrag: ord-d371bace8baf473896f3663296136c64
Quelldatensatz: uspto-grants-1997_09
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US05665719

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