- Preparation method of Eperisone hydrochloride impurity F
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The invention provides a preparation method of Eperisone hydrochloride impurity F, which comprises the following steps: 2-bromoethylbenzene is used as a raw material, 1- (2-ethylphenyl) propanol is obtained through Grignard reaction, 2-ethyl propiophenone is obtained through oxidation reaction, and finally the Eperisone hydrochloride impurity F is obtained through Mannich reaction of the 2-ethyl propiophenone, paraformaldehyde and piperidine hydrochloride by a one-pot method. The structure of the Eperisone hydrochloride impurity F is shown as a formula (I), the purity of theEperisone hydrochloride impurity F obtained by adopting the technical scheme provided by the invention can reach 99%, and the Eperisone hydrochloride impurity F can be used as a reference substance for experimental research.
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- A modified Mannich reaction using 1,3-dioxolane
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Mannich reaction of ketones using 1,3-dioxolane instead of formaldehyde, paraformaldehyde, or 1,3,5-trioxane afforded the corresponding Mannich bases in high yields. Under the same conditions the aminomethylation of aromatics did not proceed but the intramolecular aminomethylation, like a Pictet-Spengler type reaction, proceeded smoothly.
- Sumita,Koumori,Ohno
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p. 1676 - 1678
(2007/10/02)
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