US4032520A
Expired / Lapsed
US
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Synthesis of cyclopentanol
Assignee: Individual
•
Filing: 1975-09-10
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Granted: 1977-06-28
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Expires: 1995-09-10
Abstract
Abstract Process for synthesizing the lactone, (dl) 3,3a beta-4,5-6,6a beta-hexahydro-4beta(3-hydroxyl-1-trans-octenyl)-5alpha-hydroxy-2-oxo-2H-cyclopenta[b]furan, a known intermediate for producing prostaglandin E 2 and F 2 .sub.α and a process for preparing 11-desoxy and 11-alkyl prostaglandins from dihydroresorcyclic acid.
Inventors
- 👤 Frank Kienzle
- 👤 Perry Rosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:36
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/93; C07D307/935; C07C; C07C405/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
28 words
A compound of the formula ##STR29## wherein R 12 ' is hydroxy or tetrahydropyranyloxy, benzyloxy, benzhydryloxy, trialkylsilyloxy, α-lower alkoxy-lower alkyloxy, 4-methoxy-5,6-dihydro-2H-pyranyloxy or trityloxy or enantiomers or racemates thereof.
Claim 2
Dependent Claim
28 words
A compound of the formula ##STR29## wherein R 12 ' is hydroxy or tetrahydropyranyloxy, benzyloxy, benzhydryloxy, trialkylsilyloxy, α-lower alkoxy-lower alkyloxy, 4-methoxy-5,6-dihydro-2H-pyranyloxy or trityloxy or enantiomers or racemates thereof.
Claim 3
Dependent Claim
12 words
The compound of claim 1 wherein said compound is 2β[ 3α(2-tetrahydropyranyloxy-1-trans-octenyl]-3α-carboxymethyl-4.alpha.-hydroxy-cyclopentane-1α-carboxylic acid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |