3522-98-3Relevant articles and documents
Preparation method of 4-methylpiperidine salt
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Paragraph 0029; 0031, (2018/09/12)
The invention relates to a preparation method of 4-methylpiperidine salt. According to the invention, 1,5-dihalide-3-pentanone is used as an initial raw material, through a wittig reaction, halogenated amine hydrolysis, salt forming with acid, the 4-methylpiperidine salt is obtained with high efficiency. The preparation method has the beneficial effects that the raw material source is wide, cost is low, operation is simple, a solvent is recycled and reused, the waste liquid discharge capacity is less, the product recovery rate is high, and industrialization is easily realized.
Method for preparation of Efinaconazole
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Paragraph 0071; 0072; 0073, (2017/08/28)
The invention provides a method for preparation of Efinaconazole. The method comprises the following step: in the presence of iodide or its hydrate, in a reaction solvent and alkali, a compound as shown in the formula 2 is contacted with a compound as sho
PROCESS FOR PRODUCING 1-TRIAZOLE-2-BUTANOL DERIVATIVES
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Paragraph 0034; 0035; 0036; 0037, (2013/06/27)
An object is to provide a process for producing the compound of formula 1 in higher yield by the ring-opening addition reaction of epoxytriazole with amine under mild conditions without using a large excess of 4-methylenepiperidine. The process for producing (2R,3R)-2-(2,4-difluorophenyl)-3-(4-methylenepiperidin-1-yl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol or an acid addition salt thereof comprises reacting (2R,3S)-2-(2,4-difluorophenyl)-3-methyl-2-[(1H-1,2,4-triazol-1-yl)methyl]oxirane with an acid addition salt of 4-methylenepiperidine in a reaction solvent in the presence of a hydroxide of an alkali metal or an alkaline earth metal selected from the group consisting of lithium, sodium, calcium, and strontium, or a hydrate thereof.