US Patent

US11261198 — Process for preparing substituted polycyclic pyridone derivative and crystal thereof

Formulation · Assigned to Shionogi and Co Ltd · Expires 2038-09-25 · 12y remaining

Vulnerability score 50/100 Moderate — design-around opportunities exist

What this patent protects

This patent protects a process for preparing a specific compound, a substituted polycyclic pyridone derivative, and its crystal.

USPTO Abstract

The present invention provides a process for preparing a compound of the formula (II):wherein R2 is unsubstituted alkyl,characterized by reacting a compound of the formula (I):wherein R1 is hydrogen or a protecting group other than unsubstituted alkyl,with a compound of the formula: R2—OH, wherein R2 is as defined above, in the presence of a sodium salt and/or a magnesium salt.

Drugs covered by this patent

Patent Metadata

Patent number
US11261198
Jurisdiction
US
Classification
Formulation
Expires
2038-09-25
Drug substance claim
No
Drug product claim
Yes
Assignee
Shionogi and Co Ltd
Source
FDA Orange Book + USPTO grounding via Google Patents

Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.

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