Related Products of 191478-99-6, 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. 191478-99-6, name is Methyl 4-amino-2,6-difluorobenzoate belongs to esters-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below.
General procedure: Pyridine-4-thiol (16.7 g, 150 mmol) was dissolved in concentrated hydrochloric acid (110 ml) and water (30 ml). After cooling to 0 C., chlorine gas was bubbled for 1 hour. The reaction solution was diluted with ice-water (75 g), and neutralized by gradually adding sodium hydrogen carbonate. After extraction with methylene chloride (150 ml×3) cooled to 5 to 10 C., the organic layers were combined and dried over anhydrous sodium sulfate. Then, the solvent was removed under reduced pressure to obtain the corresponding sulfonyl chloride. In another reaction vessel, methyl 4-amino-2,6-difluorobenzoate (16.9 g, 90.3 mmol) and pyridine (10 ml) were dissolved in methylene chloride (200 ml). After cooling to -10 C., the above-described solution of the sulfonyl chloride in methylene chloride was added thereto, followed by stirring at room temperature for 6 hours. The organic layer was washed with 0.1 N hydrochloric acid (200 ml×2), and the solvent was removed under reduced pressure. The residue was purified by silica gel column chromatography (petroleum ether/ethyl acetate=2:1 to 1:1) to obtain the title compound (11.2 g, 38% over two steps). [0839] MS (ESI) m/z 329 (M+H)+
The synthetic route of Methyl 4-amino-2,6-difluorobenzoate has been constantly updated, and we look forward to future research findings.
Reference:
Patent; AJINOMOTO CO., LTD.; Ueno, Hirokazu; Yamamoto, Takashi; Takashita, Ryuta; Yokoyama, Ryohei; Sugiura, Toshihiko; Kageyama, Shunsuke; Ando, Ayatoshi; Eda, Hiroyuki; Eviryanti, Agung; Miyazawa, Tomoko; Kirihara, Aya; Tanabe, Itsuya; Nakamura, Tarou; Noguchi, Misato; Shuto, Manami; Sugiki, Masayuki; Dohi, Mizuki; US2015/51395; (2015); A1;,
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