Ethyl Acetate → 1-(5-tert-Butyl-2-methyl-2H-pyrazol-3-yl)-3-(4-hydroxymethyl-phenyl)urea

HRID 499195

Reaktionsgleichung

C([O:3][C:4](=O)[C:5]1[CH:10]=[CH:9][C:8]([NH:11][C:12]([NH:14][C:15]2[N:16]([CH3:24])[N:17]=[C:18]([C:20]([CH3:23])([CH3:22])[CH3:21])[CH:19]=2)=[O:13])=[CH:7][CH:6]=1)C.CC(C[AlH]CC(C)C)C.C(OCC)(=O)C.C(C(C(C([O-])=O)O)O)([O-])=O.[Na+].[Na+]>C(Cl)Cl>[C:20]([C:18]1[CH:19]=[C:15]([NH:14][C:12]([NH:11][C:8]2[CH:7]=[CH:6][C:5]([CH2:4][OH:3])=[CH:10][CH:9]=2)=[O:13])[N:16]([CH3:24])[N:17]=1)([CH3:23])([CH3:21])[CH3:22]

Komponenten

Reaktionsbedingungen

Temperatur: 0 °C

Versuchsvorschrift

To a dry flask is added 872 mg (2.5 mmol) of 4-[3-(5-tert-butyl-2-methyl-2H-pyrazol-3-yl)-ureido]-benzoic acid ethyl ester in 30 mL dry methylene chloride and cooled to 0° C. Next, 10.12 mL of 1M DIBAL in hexanes (4 eq., 10.12 mmol) is added and the reaction is allowed to reach room temperature. The mixture is then stirred for 1 hour, and 60 mL of ethyl acetate and 100 mL of sodium tartrate saturated aqueous solution are added, and the mixture is stirred for another 30 min. Then the organic layer is separated and washed with water and dried over magnesium sulfate, filtered, and evaporated to a white solid weighing 720 mg (2.4 mmoles, 95%, ES+(m/z) 303 [M+H]).

Aufarbeitung

customto reach room temperature
stirringthe mixture is stirred for another 30 min
customThen the organic layer is separated
washwashed with water
dry with materialdried over magnesium sulfate
filtrationfiltered
customevaporated to a white solid

Quellen und Nachweise

ORD-Eintrag: ord-ef847b99baa64e74be6f19788bbd3d59
Quelldatensatz: uspto-grants-2010_08
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US07767674B2

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