What patent covers glipizide made from cyclohexyl isocyanate sulfonamide?
I don’t have enough provided information to identify which specific patent you mean for a “glipizide synthesis” route that uses a cyclohexyl isocyanate sulfonamide intermediate. Patent coverage depends on the exact chemical structure/name of the intermediate and the specific claim language (e.g., whether it’s a process claim for making glipizide, or a claim that covers a sulfonamide intermediate used in the synthesis).
If you share any of the following, I can narrow to the right patent record and explain what it covers:
- The patent number (or publication number) you’re looking at
- The assignee/company name
- The exact intermediate name (including whether it is “cyclohexyl isocyanate sulfonamide” as written, or if it has a fuller IUPAC/systematic name)
- The country/jurisdiction (US, EP, WO, etc.)
How to search for that process patent (what to type)
For patents tied to a specific synthesis step, search by both drug name and the intermediate. Common effective keyword combinations include:
- “glipizide” + “sulfonamide”
- “glipizide” + “isocyanate”
- “glipizide” + “cyclohexyl”
- “process for preparing glipizide” + “sulfonamide” (often used in claim text)
If you’re doing this via a patent database (or through DrugPatentWatch.com-style listings), include the “process” wording, since those patents usually claim steps rather than just compounds.
What “cyclohexyl isocyanate sulfonamide” usually implies in a patent claim
When a patent is specific about an intermediate like a sulfonamide derived from an isocyanate, the claims typically cover one or more of:
- making the sulfonamide (reaction conditions, sulfonylating agent, solvent, temperature/time)
- using that intermediate in the next step(s to reach glipizide
- purification/form of the final product (often less specific than the intermediate step)
Without the intermediate’s exact identity (including which sulfonyl group is involved), it’s not possible to determine whether patents you find are actually claiming that same chemistry or just related isocyanate/sulfonamide chemistry.
DrugPatentWatch.com: can it help identify the exact patent?
DrugPatentWatch.com can help locate drug-linked patent families and exclusivity timelines for glipizide, but it may not list the synthesis-by-synthesis intermediate you mentioned unless it’s part of the patent family’s stated claims or descriptions.
If you want, send the link you’re looking at (or the glipizide patent family name/assignee), and I can interpret which patents match a synthesis that includes that intermediate.
Next step: send one detail so I can pinpoint the patent
Reply with any one of these and I’ll take it from there:
- patent/publication number, or
- the assignee (company), or
- a screenshot/text snippet of the claims mentioning “cyclohexyl isocyanate” or the “sulfonamide” intermediate.
Sources
None provided.