Process for the preparation of N-L-aminodicarboxylic acid esters and new compositions used in the preparation thereof

摘要

This present invention provides an improved method for producing N-L-aspartyl-D-alanine fenchyl ester or N-L-aspartyl-methylalanine fenchyl ester and new compositions of fenchol derivatives which are intermediate compositions in the preparation of the above described fenchyl esters.