39856-50-3Relevant articles and documents
Green preparation method of anti-cancer drug palbociclib intermediate
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Paragraph 0030-0069, (2021/04/14)
The invention belongs to the technical field of chemicals, and particularly relates to a green preparation method of an anti-cancer drug palbociclib intermediate. Zirconium nitrate and ammonium metatungstate are used as raw materials, a Zr/W composite oxide is prepared by adopting a homogeneous precipitation method, and an acidified tungsten/zirconium bimetallic oxide is prepared by sulfuric acid impregnation and is used for catalyzing hydrogen peroxide to oxidize 2-amino-5-bromopyridine to prepare 2-nitro-5-bromopyridine. The catalytic oxidation process is green and pollution-free, and waste acid cannot be generated; and the oxidation process is relatively mild, basically no 3, 5-dibromo-2-aminopyridine byproduct is generated in the oxidation process, and the purity and yield of the crude product are relatively high.
A Palumbo Xilin synthesis of intermediates method (by machine translation)
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Paragraph 0023; 0024; 0025; 0026, (2018/10/19)
The present invention provides a Palumbo Xilin synthesis of intermediates method, and in particular relates to technical field of drug synthesis, the invention of the Palumbo vial is means intermediate 4 - (6 - aminopyridin - 3 - yl) piperazine - 1 - carboxylic acid tert-butyl, in order to 2 - amino - 5 - bromo pyridine as the starting material, through oxidation, coupling, reduction to obtain the target product of the process route, to the influence of factors experimental study of the system, compared with the conventional preparation process, the invention process route in the production cost, the operation of the technique, the product yield and purity and environmental protection there are obviously increased and improved. (by machine translation)
Preparation method of 2-nitro-5-bromopyridine
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Paragraph 0035; 0044; 0045, (2017/02/17)
The invention relates to a preparation method of 2-nitro-5-bromopyridine. The 2-nitro-5-bromopyridine is adopted as a starting raw material, glacial acetic acid is adopted as a solvent, peracetic acid is adopted as an auxiliary material, and distillation, washing, alkali washing, filtering, drying and recrystallization are performed to obtain a target product. According to the method, the synthesis yield is high, the equipment corrosion is small, the safety is high, acetic acid can be recycled, the cost is saved, and little environmental pollution is caused.