摘要:
Substituted triols of Formula D-R wherein R represents the group of Formulae (a), (b), (c) or (d), can be used as active substances in drugs against hyperproteinemia.
摘要:
The present invention relates to a high enantio-selective process for producing pure enantiomeric cyclopentane and cyclopentene-β-amino acids of the general formula (I) in which A and L, A and D or E and L, D and E, R2, R3, T and R1 have the meanings given in the description. In the process, meso-dicarboxylic acid anhydride is first converted into the enantiomer-free dicarboxylic acid mono-ester via the intermediate, enantiomer-free salt stage by asymmetrical alcoholysis with alcohols and in the presence of equimolar quantities of a chiral amine base in enantiomer-free form, in inert solvents, and then the enantiomer-free amides are produced after NH¿3? activation, the ester group is separated out in a further step and finally a Hofmann transposition is performed with alkaline or alkaline earth hypochlorites in an aqueous alkaline or alkaline earth hydroxide solution, in solution the free amine function is first blocked with a typical amino-protective group and, after the protected compounds have been isolated in normal conditions, they are separated out by the usual methods, retaining the pure enantiomer.