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Methyl 3-isocyanatobenzoate → 3-[3-(2,2-Diethoxyethyl)-3-(4-isopropylphenyl)ureido]benzoic acid methyl ester

HRID 751010
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 751010
[CH:1]([C:4]1[CH:9]=[CH:8][C:7]([NH:10][CH2:11][CH:12]([O:16][CH2:17][CH3:18])[O:13][CH2:14][CH3:15])=[CH:6][CH:5]=1)([CH3:3])[CH3:2].[C:19]([C:23]1[CH:24]=[C:25]([N:29]=[C:30]=[O:31])[CH:26]=[CH:27][CH:28]=1)([O:21][CH3:22])=[O:20]>ClCCl>[CH:1]([C:4]1[CH:5]=[CH:6][C:7]([N:10]2[CH:11]=[CH:12][N:29]([C:25]3[CH:24]=[C:23]([CH:28]=[CH:27][CH:26]=3)[C:19]([OH:21])=[O:20])[C:30]2=[O:31])=[CH:8][CH:9]=1)([CH3:2])[CH3:3].[CH3:22][O:21][C:19](=[O:20])[C:23]1[CH:28]=[CH:27][CH:26]=[C:25]([NH:29][C:30]([N:10]([CH2:11][CH:12]([O:13][CH2:14][CH3:15])[O:16][CH2:17][CH3:18])[C:7]2[CH:8]=[CH:9][C:4]([CH:1]([CH3:2])[CH3:3])=[CH:5][CH:6]=2)=[O:31])[CH:24]=1
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Komponenten

5

Edukt 2

HCID 2733366Methyl 3-isocyanatobenzoateHCID 196009444-Isopropyl-N-(2,2-diethoxyethyl)aniline

Produkt 2

HCID 103140423-[3-(4-Isopropylphenyl)-2-oxo-2,3-dihydroimidazol-1-yl]benzoic acidHCID 666034673-[3-(2,2-Diethoxyethyl)-3-(4-isopropylphenyl)ureido]benzoic acid methyl esterAusbeute 170,4 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344
Dichloromethane
Lösungsmittel

Versuchsvorschrift

A solution of N-(4-isopropylphenyl)-2,2-diethoxyethylamine (0.50 g, 2.0 mmol) prepared above and 3-carbomethoxyphenyl isocyanate (0.36 g, 2.05 mmol) in dry dichloromethane (10 mL) was stirred at room temperature overnight. The solution was then chromatographed (silica gel, hexanes:ethyl acetate, 8:2) to give the pure urea, 3-[3-(2,2-diethoxyethyl)-3-(4-isopropylphenyl)ureido]benzoic acid methyl ester as a colorless oil (0.73 g, 85.3%). MS (ES−) m/z: 427. This was then stirred with HCl (0.5 M, 50 mL) at 80° C. for 4 h. After cooling to room temperature, the white precipitate formed was collected and purified by chromatography (silica gel, dichloromethane:ethyl acetate, 9:1) to give pure methyl 3-[3-(4-isopropylphenyl)-2-oxo-2,3-dihydroimidazol-1-yl]benzoate as white solid [0.42 g, 73.7%, MS (ES+) m/z: 337]. The solid was then treated with boron tribromide in dichloromethane (1.0 M, 4.0 mL) at, room temperature overnight. The volatiles were removed in vacuum and the residue was suspended in water and stirred for 30 min. The solid was collected by filtration and washed with water to furnish 3-[3-(4-isopropylphenyl)-2-oxo-2,3-dihydroimidazol-1-yl]benzoic acid (0.40 g, 100%). m.p. 283-285° C. 1H NMR (CDCl3, 300 MHz) δ (ppm) 1.24 (d, 6H), 2.84-3.00 (m, 1H), 6.69 (d, 1H), 6.74 (d, 1H, 7.26 (d, 2H), 7.45-7.54 (m, 3H), 7.91 (d, 1H), 8.02 (d, 1H), 8.12 (s, 1H). MS (ES−) m/z: 321.

Aufarbeitung

  1. customThe solution was then chromatographed (silica gel, hexanes:ethyl acetate, 8:2)

Quellen und Nachweise

ORD-Eintrag
ord-e9d943244b50407d94b463b9147f5ded
Quelldatensatz
uspto-grants-2008_07
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US07405233B2

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