Food or edible material: processes – compositions – and products – Products per se – or processes of preparing or treating... – Noncarbohydrate sweetener or composition containing same
Reexamination Certificate
2005-01-11
2005-01-11
Wong, Leslie (Department: 1761)
Food or edible material: processes, compositions, and products
Products per se, or processes of preparing or treating...
Noncarbohydrate sweetener or composition containing same
C560S037000, C560S040000, C560S041000
Reexamination Certificate
active
06841183
ABSTRACT:
N-[N-[3-(2-hydroxy-substituted phenyl)propyl]-L-α-aspartyl]-L-phenylalanine 1-methyl ester derivatives, which are useful as sweeteners, may be conveniently produced by subjecting a 2-hydroxychroman derivative having various substituents on the benzene ring and aspartame to a reductive alkylation reaction. These compounds may be purified by subjecting such a derivative containing one or more impurities to a crystallization step to crystallize the same. Further, there are provided a process for producing dialkoxychroman derivatives useful as intermediates for the production of such aspartame derivatives in the above process, and novel dialkoxychroman derivatives thus produced, which are excellent as the production intermediate.
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N. Cohen, et al., “Lewis Acid Mediated Nucleophillic Substitution Reactions of 2-Alkoxy-3,4-dihydro-2H-1-benzopyrans: Regiochemistry and Utility in the Synthesis of 3,4-Dihydro-2H-1-benzopyran-2-carboxylic Acids”, J. Org. Chem., vol. 54, No. 14, 1989, pp. 3282-3292.
Aoki Yuuichi
Fujita Shinji
Kawahara Shigeru
Nagashima Kazutaka
Ono Eriko
Ajinomoto Co. Inc.
Wong Leslie
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