Synthetic method of 2-(N-alkyl)aminooimidazole derivatives
A technology of aminoimidazole and synthesis method, which is applied in the direction of organic chemistry, can solve the problems of low atomic efficiency and environmental pollution, and achieve the effect of high economic efficiency and broad development prospects
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[0024] Example 1: Preparation of N-benzyl-1H-benzimidazol-2-amine
[0025] N-benzyl-1H-benzo[d]imidazol-2-amine
[0026]
[0027] Under nitrogen protection, add 2-aminobenzimidazole (133 mg, 1 mmol), [Cp*IrCl 2 ] 2 (1.6 mg, 0.002 mmol, 0.2 mol%), potassium carbonate (13.8 mg, 0.1 mmol, 10 mol%) and benzyl alcohol (432 mg, 4 mmol) were added to a 20 ml Schlenk reaction flask. Reaction mixture at 130 o After reacting at C for 12 hours, cool to room temperature. The solvent was removed by rotary evaporation, and then column chromatography (developing solvent: ethyl acetate / petroleum ether) was used to obtain the pure target compound with a yield of 96%. The product NMR spectrum and high-resolution mass spectra were as follows figure 1 with figure 2 As shown,
[0028] 1 H NMR (500 MHz, DMSO-d 6 ) δ 7.37 (d, J = 7.3 Hz, 2H, ArH), 7.32 (t, J = 7.6 Hz, 2H, ArH), 7.23 (t, J = 7.2 Hz, 1H, ArH), 7.13-7.11 (m, 2H, ArH), 6.86 (dd, J = 5.7 Hz and 3.2 Hz, 2H, ArH), 4.51 (d, J = 5.3 Hz,...
Example Embodiment
[0029] Example 2: Preparation of N-(4-methylphenyl)-1H-benzimidazole-2-amine
[0030] N-(4-methylbenzyl)-1H-benzo[d]imidazol-2-amine
[0031]
[0032] Under nitrogen protection, add 2-aminobenzimidazole (133 mg, 1 mmol), [Cp*IrCl 2 ] 2 (1.6 mg, 0.002 mmol, 0.2 mol%), potassium carbonate (13.8 mg, 0.1 mmol, 10 mol%) and 4-methylbenzyl alcohol (488 mg, 4 mmol) were added to a 20 ml Schlenk reaction flask. Reaction mixture at 130 o After reacting at C for 12 hours, cool to room temperature. The solvent was removed by rotary evaporation, and then the pure target compound was obtained by column chromatography (developing solvent: ethyl acetate / petroleum ether). The yield: 84%. The product NMR spectra and high-resolution mass spectra such as image 3 with Figure 4 As shown,
[0033] 1 H NMR (500 MHz, DMSO-d 6 ) δ 10.77 (s, 1H, NH), 7.26 (d, J = 7.4 Hz, 2H, ArH), 7.12 (d, J = 7.1Hz, 4H, ArH), 6.87 (s, 1H, ArH), 6.83 (s, 1H, ArH), 4.45 (br s, 2H, CH 2 N), 2.26 (s, 3H, CH 3 ); HRMS-EI...
Example Embodiment
[0034] Example 3: Preparation of N-(4-methoxyphenyl)-1H-benzimidazole-2-amine
[0035] N-(4-methoxybenzyl)-1H-benzo[d]imidazol-2-amine
[0036]
[0037] Under nitrogen protection, add 2-aminobenzimidazole (133 mg, 1 mmol), [Cp*IrCl 2 ] 2 (1.6 mg, 0.002 mmol, 0.2 mol%), potassium carbonate (13.8 mg, 0.1 mmol, 10 mol%) and 4-methoxybenzyl alcohol (552 mg, 4 mmol) were added to a 20 ml Schlenk reaction flask. Reaction mixture at 130 o After reacting at C for 12 hours, cool to room temperature. The solvent was removed by rotary evaporation, and then the pure target compound was obtained by column chromatography (developing solvent: ethyl acetate / petroleum ether), yield: 87%
[0038] 1 H NMR (500 MHz, DMSO-d 6 ) δ 10.75 (s, 1H, NH), 7.30 (d, J = 7.7 Hz, 2H, ArH), 7.11 (d, J = 6.1 Hz, 2H, ArH), 7.01 (br s, 1H, NH), 6.88 (m, 4H, ArH), 4.42 (s, 2H, CH 2 N), 3.71 (s, 3H, OCH 3 ); HRMS-EI (70 eV) m / z calcd for C 15 H 16 N 3 O [M+H] + 254.1293, found 254.1300.
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