US6002023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-debenzoyl-2-acyl taxol derivatives and method for making same
Assignee: Virginia Tech Intellectual Properties Inc
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Filing: 1997-10-15
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Granted: 1999-12-14
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Expires: 2017-10-15
Abstract
Abstract The present invention relates to 2-debenzoyl-2-acyl taxol derivatives, analogues thereof and methods for making same. Compounds of the present invention include compounds having the general formula: wherein R1 is an alkyl or substituted alkyl; R2 is selected from the group consisting of H and C(O)Ra; R3 is selected from the group consisting of H, protecting groups, Rb, and C(O)Rb; R4 is selected from the group consisting of H and C(O)Rc, and wherein Ra, Rb, and Rc are independently selected from the group consisting of alkyls, substituted alkyls, alkenyls, alkynyls, aryls, and substituted aryls; provided that Ra is other than phenyl and 3-hydroxyphenyl.
Inventors
- 👤 David G. I. Kingston
- 👤 Ashok Gopal Chaudhary
- 👤 Milind Moreshwar Gharpure
- 👤 John Matthew Rimoldi
- 👤 A.A. Leslie Gunatilaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:22
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/02; C07D405/12; A; A61; A61P; A61P35/00; C07D305/00; C07D305/14; C07D409/00; C07D409/02; C07D409/12; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
Taxol modified to possess a hydroxy group at the C-2 position of the B ring of the tetracyclic taxane nucleus.
Claim 2
Dependent Claim
20 words
Taxol modified to possess a hydroxy group at the C-2 position of the B ring of the tetracyclic taxane nucleus.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-12-13 | 2003-06-14 | 2003-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-13 | 2007-06-14 | 2007-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-13 | 2011-06-14 | 2011-12-14 | $7700.00 | Window Closed / Lapsed |