Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Reexamination Certificate
2006-07-04
2006-07-04
Tsang, Cecilia J. (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
Reexamination Certificate
active
07071349
ABSTRACT:
The present invention is to provide a purification method of obtaining N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanine of high quality in good yield with high productivity, which is accordingly suited for commercial scale application.An impurity-contaminated N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanine is crystallized from a mixed solvent of alcohol and water in a volume ratio of alcohol/water being 1 to 20 to remove a contaminating impurity into a mother liquor and give crystals of N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanine.
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International Search Report for PCT/JP02/02570 dated Jul. 2, 2002.
Kogame Yoshikazu
Matsumoto Akira
Nomura Michio
Ueda Yasuyoshi
Kanaka Corporation
Oh Taylor Victor
Sughrue & Mion, PLLC
Tsang Cecilia J.
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