[EN] CYCLIC QUATERNARY AMMONIUM SALT COMPOUND, AND PREPARATION METHOD THEREFOR AND USE THEREOF [FR] COMPOSÉ DE SEL D'AMMONIUM QUATERNAIRE CYCLIQUE, SON PROCÉDÉ DE PRÉPARATION ET SON UTILISATION [ZH] 一种环状季铵盐化合物及其制备方法和用途
Process of making optically pure L-pipecolic acid and process of making anesthetics and intermediates therefrom
申请人:Rangisetty B. Jagadeesh
公开号:US20060276654A1
公开(公告)日:2006-12-07
The present invention describes a novel process of preparation of optically pure L-Pipecolic acid and an improved process for the conversion of L-pipecolic acid to L-N-(2,6-dimethylphenyl)-1-propyl-2-piperidinocarboxamide, its hydrochloride salt and hydrochloride monohydrate.
The local anesthetic, L-N-n-propylpipecolic acid-2,6-xylidide, namely: ##STR1## This compound is prepared by chlorinating L-pipecolic acid to yield the acid chloride, namely L-pipecolic acid chloride. The acid chloride is then reacted with 2,6-xylidine to yield L-pipecolic acid-2,6-xylidide. The L-N-pipecolic acid-2,6-xylidide is then propylated to yield the L-N-n-propylpipecolic acid-2,6-xylidide, which is a potent local anesthetic for humans and is of relatively low toxicity.