Patent US4474971A successfully refreshed from Google Patents.
US4474971A
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(Tetrahydropyran-2-yl)-aldehydes
Assignee: Sandoz Inc
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Filing: 1982-09-29
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Granted: 1984-10-02
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Expires: 2002-09-29
Abstract
Abstract Single enanitiomers of 6-(2-hydrocarbyl-substituted ethenyl)-bearing, 4-hydroxy tetrahydro-2H-pyran-2-ones, e.g., 6α-[2-(2-methyl-1-naphthyl)ethenyl]-3,4,5,6-tetrahydro-4β-hydroxy-2H-pyran-2-one (4R,6S) are obtained by a multi-step process which includes protecting and deprotecting hydroxy groups at various stages.
Inventors
- 👤 James R. Wareing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:05
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/04; C07D309/00; C07D309/02; C07D309/08; C07D309/10; C07D309/16; C07D309/28; C07D309/30; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C07H; C07H15/00; C07H15/02; C07H15/04; C07H23/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
21 words
An aldehyde compound of the formula: ##STR20## wherein each of P 1 and P 2 , independently, is a protecting group.
Claim 2
Dependent Claim
21 words
An aldehyde compound of the formula: ##STR20## wherein each of P 1 and P 2 , independently, is a protecting group.
Claim 3
Dependent Claim
20 words
A compound of claim 1 in which P 1 is an unbranched alkyl having from 1 to 4 carbon atoms.
Claim 4
Dependent Claim
11 words
A compound of claim 2 in which P 1 is methyl.
Claim 5
Dependent Claim
12 words
The compound of claim 3 in which P 2 is diphenyl t-butylsilyl.
Claim 6
Dependent Claim
12 words
A compound of claim 4 which is in the 4R, 6S form.
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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |