Patent ID: 6284892
Filing Date: 2001-09-04
Classification: C07D

Abstract:
A process for the production of a salt of formula (I) ##STR12##wherein X.sup..crclbar. represents an inorganic anion, m=1, 2, or 3, and R represents a linear (C.sub.1 -C.sub.4)-alkyl radical,which comprises:a) reacting an .omega.-amino-.alpha.-amino acid with a compound of formula (IV) ##STR13##wherein Y=C1, Br or OMe or ##STR14##and R is linear (C.sub.1 -C.sub.4)-alkyl radical or an aryl radical to give a compound of formula (II) ##STR15##b) oxidizing the compound of formula (II) to give a compound of formula (III) ##STR16##c) cyclizing the compound of formula (III) in the absence of water in the presence of an acid by ring closure to give the salt compound of formula (I).