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Potassium Carbonate → 1-(4-t-Butoxycarbonyl-benzyl)-5-propyl-1H-pyrazole-3-carboxylic acid ethyl ester

HRID 1183571
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Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 1183571
[C:1]([O:5][C:6](=[O:15])[C:7]1[CH:12]=[CH:11][C:10]([CH2:13]Br)=[CH:9][CH:8]=1)([CH3:4])([CH3:3])[CH3:2].[CH2:16]([O:18][C:19]([C:21]1[CH:25]=[C:24]([CH2:26][CH2:27][CH3:28])[NH:23][N:22]=1)=[O:20])[CH3:17].C(=O)([O-])[O-].[K+].[K+].[Li+].[Cl-]>CN(C=O)C>[CH2:16]([O:18][C:19]([C:21]1[CH:25]=[C:24]([CH2:26][CH2:27][CH3:28])[N:23]([CH2:13][C:10]2[CH:11]=[CH:12][C:7]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:15])=[CH:8][CH:9]=2)[N:22]=1)=[O:20])[CH3:17]
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Komponenten

6

Edukt 4

HCID 11430Potassium CarbonateHCID 433294Lithium ChlorideHCID 7365260ethyl 3-propyl-1H-pyrazole-5-carboxylateHCID 11414578Tert-butyl 4-(bromomethyl)benzoate

Produkt 1

HCID 598309141-(4-t-Butoxycarbonyl-benzyl)-5-propyl-1H-pyrazole-3-carboxylic acid ethyl ester

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228
Dimethylformamide
Lösungsmittel

Versuchsvorschrift

To the recovered intermediate (19a) (1.4 g, 5 mmol, 1.0 eq) dissolved into 15 mL DMF, was added 5-propyl-1H-pyrazole-3-carboxylic acid ethyl ester (910 mg, 5.0 mmol, 1.0 eq) and potassium carbonate (0.8 g, 5.5 mmol, 1.1 eq) and the mixture was stirred at room temperature for 16 hours. The mixture was then added to 50 mL of 10% aq. LiCl solution and extracted with 50 mL EtOAc. The organic was dried over MgSO4, and concentrated under reduced pressure to yield intermediate (19b) and its regioisomer in a 1:1 ratio. The recovered regioisomers were dissolved into 25 mL MeOH. To this was added 10 mL of 1M NaOH and the mixture was stirred at room temperature over night. The mixture was acidified with acetic acid and concentrated under reduced pressure. The recovered oil was purified by preparatory HPLC, producing the desired regioisomer of the title compound as a white solid TFA salt after lyophilization (230 mg). 1H NMR (DMSO) 0.89 (t, 3H), 1.52 (s, 9H), 5.71 (s, 2H), 6.71 (s, 1H), 7.15 (d, 2H), 7.83 (d, 2H), 13.28 (br s, 1H).

Aufarbeitung

  1. extractionextracted with 50 mL EtOAc
  2. dry with materialThe organic was dried over MgSO4
  3. concentrationconcentrated under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-89c095f3f8a141c7badf47ff736efa99
Quelldatensatz
uspto-grants-2014_03
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US08664254B2

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