Preparation of n-protected .alpha.-l-aspartyl-l-phenylalanine methyl ester
CA 1339658 C · Owner: Mitsui Toatsu Chemicals, Incorporated · Inventors: Higuchi, Chojiro; Ajioka, Masanobu; Yamaguchi, Akihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are a process for preparing N-protected aspartic anhydride by the reaction of N-protected aspartic acid with phosgene, a process for preparing an N-protected .alpha.-L-aspartyl-L-phenylalanine methyl ester from N-protected aspartic anhydride and mineral acid salt of L-phenylalanine methyl ester, and a process for preparing N-benzyloxycarbonyl-L-aspartic anhydride by the reaction of Nbenzyloxycarbonyl-L-aspartic acid with acetic anhydride.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 3, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 3, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.