|
In 1,4-dioxane; for 0.75h;Reflux; |
The solution of commercial 4-nitro-l,2-phenylenediamine (0.31 g) and 3-(4- chlorophenyl)glutaric anhydride (0.45 g) in 1,4-dioxane (3 ml) was stirred under reflux for 0.75 h. 4M HCI in 1,4-dioxane (3 ml) was added and the solution is further heated to reflux for 1 h. After cooling to rt the precipitate is collected by suction filtration and washed with 1,4-dioxane and diethyl ether. The crude is recrystallised from acetic acid to give 4-(5-benzoyl-2-benzimidazolyl)-3-(4- chlorophenyl)butanoic acid HCI (0.59 g) as beige coloured solid. 1H-NMR (500 MHz, DMSO-d6)): delta (ppm) = 2.72 (dd, J = 16.2, 8.7 Hz, IH), 2.84(dd, J = 16.2, 6.1 Hz, IH), 3.41 (dd, J = 14.9, 8.9 Hz, IH), 3.52 (dd, J = 14.9, 7.0 Hz, IH), 3.85 (m, IH), 7.30 (d, J = 8.5 Hz, 2H), 7.36 (d, J = 8.5 Hz, 2H), 7.85 (d, J = 9.0 Hz, IH), 8.23 (dd, J = 9.0, 2.2 Hz, IH), 8.51 (d, J = 2.1 Hz, IH). 13C-NMR and DEPT (125 MHz, DMSO-d6) : delta (ppm) = 33.46 (CH2), 39.28 (CH), 39.64 (CH2), 110.68 (CH), 114.50 (CH), 119.70 (CH), 128.31 (2 CH), 129.19 (2 CH), 131.36 (C), 132.76 (C), 136.93 (C), 140.97 (C), 144.01 (C), 156.90 (C), 172.23 (CO). |