US3558637A
Expired / Lapsed
US
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1-(thianaphthenyl- or benzofuranylalkyl)-4-phenyl-4-piperidinol esters
Assignee: Smith Kline & French Laboratories Ltd
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Filing: 1969-10-10
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Granted: 1971-01-26
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Expires: 1989-10-10
Abstract
Abstract 1-(THIANAPHTHENYLALKYL OR BENZOFURANYLALKYL)-4-PHENYL4-PIPERIDINOLS, PREPARED BY VARIOUS METHODS STARTING WITH A HALOMETHYLTHIANAPHTHENE OR BENZOFURAN, OR A THIANAPHTHENE- OR BENZOFURANALKANOIC ACID. 4-PHENYL-4-PIPERIDINOLS ARE CONDENSED WITH ACID HALIDES, ESTER ANHYDRIDES, OR DIAZOKETONES TO GIVE AMIDES, WHICH ARE REDUCED TO THE PRODUCTS WITH LITHIUM ALUMINUM HYDRIDE. ESTERS ARE PREPARED BY ACYLATING OF THE PIPERIDINOLS. TETRAHYDROPYRIDINES ARE PREPARED BY DEHYDRATION OF THE PIPERIDINOLS. THE PIPERIDINOL AND TETRAHYDROPYRIDINE COMPOUNDS HAVE TRANQUILIZING ACTIVITY, WHILE THE ESTERS HAVE ANALGESIC ACTIVITY.
Inventors
- 👤 Carl Kaiser
- 👤 Charles L Zirkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:05
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/78; C07D307/79; C07D333/00; C07D333/50; C07D333/52; C07D333/54; C07D333/60
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |