US3931234A
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3,3A-Beta-4,5,6,6a,beta-hexahydro-4beta-nitromethyl-5α-hydroxyl-2-oxo-2H-cyclopenta[b]furan and its derivatives
Assignee: Hoffmann La Roche Inc
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Filing: 1974-09-23
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Granted: 1976-01-06
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Expires: 1994-09-23
Abstract
Abstract Process for synthesizing the lactone, (dl) 3,3a beta-4,5,6,6a beta-hexahydro-4beta(3-hydroxy-1-trans-octenyl)-5α-hydroxyl-2-oxo-2H-cyclopenta[ b] furan, a known intermediate for producing prostaglandin F 2 and F 2 .sub.α from dihydroresorcyclic acid, and intermediates in this process.
Inventors
- 👤 Jane Liu Jernow
- 👤 Perry Rosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:13
CPC Classifications
C; C07; C07C; C07C405/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
A compound of the formula: ##SPC4## wherein R is hydrogen, tetra-hydropyranyl, alpha-lower alkoxy-lower alkyl, benzyl, lower alkyl silyl, alkanoyl or benzoyl; or enantiomers or racemates thereof.
Claim 2
Dependent Claim
26 words
A compound of the formula: ##SPC4## wherein R is hydrogen, tetra-hydropyranyl, alpha-lower alkoxy-lower alkyl, benzyl, lower alkyl silyl, alkanoyl or benzoyl; or enantiomers or racemates thereof.
Claim 3
Dependent Claim
11 words
The compound of claim 1 wherein said compound is 3,3a,beta-4,5,6,6a,beta-hexahydro-4beta-nitromethyl-5alpha-acetoxy-2-oxo-2H-cyclopenta [b]furan.
Claim 4
Dependent Claim
11 words
The compound of claim 1 wherein said compound is 3,3a,beta-4,5,6,6a,beta-hexahydro-4beta-nitromethyl-5alpha-hydroxyl-2-oxo-2H-cyclopenta [b]furan.
Claim 5
Dependent Claim
11 words
The compound of claim 1 wherein said compound is 3,3a,beta-4,5,6,6a,beta-hexahydro-4beta-nitromethyl-5alpha-tetrahydropyranyloxy-2-oxo-2H-cyclopenta [b]furan.
References Cited (Backward Citations)
US3816463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |