Preparation process of alpha-aspartyl-L-phenylalanine methyl ester
申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0510552A1
公开(公告)日:1992-10-28
α-L-Aspartyl-L-phenylalanine methyl ester (α-APM) is prepared by catalytic hydrogenation of N-benzyloxycarbonyl-α-L-aspartyl-L-phenylalanine methyl ester (Z-α-APM). The catalytic hydrogenation is conducted in an aqueous suspension containing the Z-α-APM in the form of particles whose average particle size is not greater than 800 µm. The starting Z-α-APM may contain up to 30 wt.% of its β-isomer provided that the process additionally includes recrystallization of the α-APM, collection of the α-APM by filtration and recycling of the filtrate for use in the aqueous suspension of Z-α-APM.
D-alpha-aminoalkanoyl-(S)-N-alpha-alkylbenzyl amides useful as intermediates for artificial sweeteners
申请人:THE COCA-COLA COMPANY
公开号:EP0779296A2
公开(公告)日:1997-06-18
The present invention relates to D-α-aminoalkanoyl-(S)-N-α-alkylbenzyl amides which are useful as intermediates for preparing artifical sweetener compounds and to methods for preparing these intermediates.