- Preparation method of fluorophenylacetic acid
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The invention relates to the field of chemical synthesis, and particularly relates to a preparation method of fluorophenylacetic acid. The invention provides a preparation method of fluorophenylacetic acid. The preparation method comprises the following steps: diazotization addition reaction: enabling a compound of the formula II to react in a system containing vinylidene chloride, acid, a diazonino reagent, a phase transfer catalyst and a copper catalyst to produce a compound of the formula III; and hydrolysis reaction: hydrolyzing the compound of the formula III to produce a compound of the formula I under the existence condition of acid. The preparation method is simply and easily available in raw materials, simple and convenient to operate, low in raw material cost, mild in reaction conditions, and low in danger, free from the use of high-price noble metal catalyst and complicated industrial operation means, and the quality of the product is stable, and therefore, the preparation method is suitable for industrial large-scale production.
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Paragraph 0082; 0083; 0085
(2017/08/24)
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- PROCESS FOR THE PREPARATION OF FLUOROPHENYLACETIC ACIDS AND DERIVATIVES THEREOF
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The object of the present invention is a process for the preparation of fluorophenylacetic acids and derivatives thereof, particularly of 2,4, 5-trifluorophenylacetic acid, starting from the corresponding mandelic acids.
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Page/Page column 23
(2008/12/06)
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- Synthesis of dihalophenylacetic acids using aromatic nucleophilic substitution strategy
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A simple synthetic strategy to dihalophenylacetic acids and specifically 3,5-difluorophenylacetic acid an important pharmaceutical intermediate was developed. The aromatic nucleophilic substitution of dihalofluorobenzenes using the anion of ethyl cyanoacetate yielded ethyl dihalophenylcyanoacetates. The basic decarboxylation of the ethyl dihalophenylcyanoacetates produced targeted dihalophenylacetic acids.
- Kowalczyk, Bruce A.
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p. 1411 - 1414
(2007/10/03)
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