1192263-89-0Relevant articles and documents
A process for preparing 3 - substituted -2 - bromo -6 - trifluoromethyl pyridine
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Paragraph 0023; 0024; 0025, (2019/02/02)
The invention discloses a method of preparing 3-substituted-2-bromo-6-trifluoromethyl pyridine. The method comprises the following steps: in the presence of nitrogen, reacting 2-bromo-6-trifluoromethyl pyridine used as a raw material with lithium diisopropylamide at a low temperature to generate 3-site lithium salt, and then adding trimethyl borate, ethyl formate and carbon dioxide respectively to generate 2-bromo-6-trifluoromethyl-3-pyridineboronic acid, 2-bromo-6-trifluoromethyl-3-pyridylaldehyde and 2-bromo-6-trifluoromethyl-3-picolinic acid; and reducing 2-bromo-6-trifluoromethyl-3-pyridylaldehyde by sodium borohydride to generate 2-bromo-6-trifluoromethyl-3-pyridinemethanol. The generated target compound is high in yield and good in purity, is an important medical intermediate, and has a wide application prospect. The method disclosed by the invention is simple and convenient to operate, easily available in raw materials, good in reaction selectivity, environment-friendly, easy for enlarged production, and capable of realizing commercialized products.