In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 188577-68-6, name is 4,5-Dichloropyridin-2-amine, the common compound, a new synthetic route is introduced below. Safety of 4,5-Dichloropyridin-2-amine
To a 50 ml round-bottomed flask containing 2-amino-4,5-dichloropyridine (0.275 g, 1.65 mmol) and cooled into an ice-bath was added conc. H2SO4 (2.79 g). The reaction mixture was stirred for 3 min and then HNO3 (70%; 0.186 g) was dropwise added. The reaction mixture was stirred at 0 C. (ice-bath) for 7 min, then heated to 55 C. and stirred at this temperature for 1 h, allowed to cool to room temperature, diluted with ice-water (15 ml) and the pH was adjusted to 7.5 with 10% aqueous NaOH. The yellow precipitate was collected by filtration, washed with water and dried in vacuo over P2O5, then absorbed on silica gel and the free running powder was placed on a 10 g isolute silica column. Elution with 2% ethyl acetate in dichloromethane afforded the title compound as a yellow solid (0.090 g, 26%); 1H-NMR (250 Mz, DMSO-d6) 7.39 (s, 2H, NH2), 8.39 (s, 1H, 6-H); LC-MS (ESI, m/z) 6.54 min-208, 210, 212 [(M+H)+, Cl2 isotopic pattern].
The synthetic route of 188577-68-6 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; THE INSTITUTE OF CANCER RESEARCH; US2009/247507; (2009); A1;,
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