4-(Diethylamino)benzaldehyde → HCID 178463809, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Methyl 3,4-diaminobenzoate (0.73 g, 4.42 mmol), 4-(diethylamino)benzaldehyde (3.0 g, 16.9 mmol) were dissolved in nitrobenzene (30 mL) and refluxed on a 145° C. oil bath overnight. The nitrobenzene was then removed in vacuo using a Kugelrohr apparatus (60° C., 0.1 mm Hg). The remaining oily residue was dissolved in CHCl3 and washed with water (3×50 mL). The combined organic layers were dried (Na2SO4), filtered, and concentrated. The crude oil was then purified through colurnn chromatography using a solvent system of 1% MeOH/CHCl3 to give methyl 2-(4-(N,N-diethyl)aminophenyl)benzimidazole-6-carboxylate as a yellowish solid (1.17 g, 82% yield). TLC (2.5% MeOH/CHCl3) Rf=0.26; 1H-NMR (500 MHz, CDCl3) 9.87 (s br, 1H), 8.30 (s br, 1H), 7.94 (dd, 1.5, 8.5, 1H), 7.91 (d, 8.5, 2H), 7.60 (s br, 1H), 6.72 (d, 8.5, 2H), 3.42 (q, 7.0, 4H), 1.21 (t, 7.0, 6H); IR (neat) 3508, 2063, 2920, 1712, 1611, 1504, 1434, 1360, 1307, 1269, 1205, 1157, 1082, 1008, 821, 751.

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