What is US5034320A (and how does it relate to vinblastine synthesis)?
US5034320A is a Google Patents entry for a patent document that includes a description of chemical syntheses connected to vinblastine (a naturally derived vinca-alkaloid used as an anti-cancer drug). To confirm exactly which steps or intermediates the document claims for “vinblastine synthesis,” you need to check the specific claims and example sections inside the US5034320A text on Google Patents.
If you open the Google Patents page for “US5034320A,” use the “Claims” tab first: that tells you the exact synthetic method scope the patent protects. Then scan the “Description” and “Examples” sections for the step-by-step procedure and any named intermediates.
How can I find the vinblastine-specific synthesis steps inside the patent?
In Google Patents, the fastest way is usually:
- Search within the document text for “vinblastine” to see where it is introduced and where the examples reference it.
- Also search for likely intermediate names or synonyms that appear in the claims (patents often define key intermediates that are synthesized in steps before reaching vinblastine).
- Read the example sequence in order, since patents often present partial routes and then a worked example that ties the intermediates together.
If you paste the claims text (or the example section that mentions vinblastine), I can help extract the actual synthesis route described there.
Is US5034320A about total synthesis, semi-synthesis, or derivatization?
Vinblastine is commonly produced via semi-synthetic routes starting from naturally available vinca alkaloid precursors rather than a fully de novo (total) synthesis from very small molecules. Whether US5034320A describes:
- total synthesis (all carbon skeleton construction),
- semi-synthesis (conversion from a precursor to vinblastine),
- or derivatization (modifying an existing vinca alkaloid to reach vinblastine),
depends on what the patent claims as starting materials and the final coupling/functional group steps.
The starting material named in the claims is the key clue.
Where can I verify details like assignee and filing history?
Google Patents includes bibliographic fields (assignee, inventors, filing date, publication date). If your goal is to understand “what synthesis method is claimed” rather than just the document number, the most useful page sections are:
- “Legal status” (if present),
- “Assignee” and “Inventors,”
- “Claims,”
- and any “Examples.”
Does DrugPatentWatch.com cover vinblastine synthesis patents?
DrugPatentWatch.com is primarily focused on drug approvals, patents, and exclusivity (often around approved products and related patent families). It may not directly list older process patents like US5034320A unless they’re part of a tracked patent family tied to commercial formulations or brand-linked IP.
If you share the exact product/brand context (or the assignee from US5034320A), I can suggest the most likely way to find it on DrugPatentWatch.
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Quick next step
If you link the exact Google Patents URL for US5034320A (or paste the “Claims” text that mentions vinblastine), I’ll summarize the specific vinblastine synthesis route and pinpoint the steps that the patent claims.
Sources: none provided (no links were included in your prompt).