Process for preparing 4-acetoxy-3- hydroxyethylazetidin-2-one derivatives
CA 1256443 A · Owner: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha · Inventors: Ohashi, Takehisa; Sada, Isao; Kan, Kazunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing 4-acetoxy-3hydroxyethylazetidin-2-one derivative having the general formula (II):, (II), wherein R1 is a protective group for hydroxy group which comprises reacting the .beta.-lactam compound having the general formula (I):, (I), wherein R1 is above R2, R3 and R4 are a lower alkyl, group of C1 to C4 phenyl group or aralkyl group and R is a protective group fox N, with acetic anhydride in the organic solvent in the presence of base and then removing the protective group for N. 4-Acetoxy-3-hydroxyethylazetidin-2-one derivatives are the useful intermediates for preparing carbapenem .beta.-lactam antibiotics such as thienamycin and penem .beta.-lactam antibiotics.
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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 June 27, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 27, 2006.
- 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.