Process for the preparation of benzothiazepines by cyclization with phosphonic acids
CA 2068231 C · Owner: Paiocchi, Maurizio · Inventors: Paiocchi, Maurizio; Giordano, Claudio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of (2S,3S)-2,3-dihydro-3-hydroxy-2-(4- -methoxyphenyl)-1,5-benzothiazepin-4(5H)-one (compound I) by cyclization of an intermediate of formula, (see formula II) wherein R represents a C1-C3 alkyl and the asterisks identify the asymmetric carbon atoms;, is described. Compound I is an intermediated useful in the synthesis of Diltiazem.
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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
- Filed May 8, 1992 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 8, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 8, 2014.
- 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
Timeline From CIPO dates
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.