Process for the preparation of piperazine derivatives
申请人:RICHTER GEDEON VEGYESZETI GYAR R.T.
公开号:EP0483932A1
公开(公告)日:1992-05-06
The invention relates to an improved process for the preparation of a piperazine derivative of the formula (I),
wherein R stands for a hydrogen atom or a methyl group, or a salt thereof.
According to the invention an amine compound of the formula (II)
is reacted with a compound of the formula (III),
in which R is as defined above, or with an acid addition salt thereof.
[EN] QUATERNARY AMMONIUM SALT COMPOUND, PREPARATION METHOD THEREFOR AND USE THEREOF<br/>[FR] COMPOSÉ DE SEL D'AMMONIUM QUATERNAIRE, SON PROCÉDÉ DE PRÉPARATION ET SON UTILISATION<br/>[ZH] 一种季铵盐类化合物及其制备方法与用途
QUATERNARY AMMONIUM SALT COMPOUND, PREPARATION METHOD THEREFOR AND USE THEREOF
申请人:WEST CHINA HOSPITAL, SICHUAN UNIVERSITY
公开号:US20220135526A1
公开(公告)日:2022-05-05
A quaternary ammonium salt compound of formula I is fast-acting and has a long-term local anaesthetic effect after a single administration, the sensory nerve block time being longer than the motor nerve block time, has both a long-acting local anaesthetic effect and a selective local anaesthetic effect, and also significantly reduces the side effects of quaternary ammonium salt compounds with the structural features of surfactants and is highly safe; thus, the compound of formula I and the pharmaceutically acceptable salt thereof can be used for the preparation of saft drugs having a long-term local anaesthetic effect and a selective local anaesthetic effect