US4137404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of tryptophans
Assignee: Hoffmann La Roche Inc
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Filing: 1977-12-20
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Granted: 1979-01-30
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Expires: 1997-12-20
Abstract
Abstract A process is disclosed for preparing racemic and optically pure tryptophans through novel intermediates.
Inventors
- 👤 Andrew D. Batcho
- 👤 Willy Leimgruber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:29
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/34; C07D309/36; C07D309/38; C07D209/00; C07D209/02; C07D209/04; C07D209/10; C07D209/18; C07D209/20; C07D263/00; C07D263/02; C07D263/30; C07D263/34; C07D263/36; C07D263/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
36 words
A compound of the formula: ##STR4## wherein R 1 and R 16 individually are halogen, lower alkyl, hydroxy, lower alkoxy, aralkyloxy, amino, trihalomethyl or hydrogen and R 9 is lower alkyl, aryl, hydrogen or halo-lower alkyl.
Claim 2
Dependent Claim
36 words
A compound of the formula: ##STR4## wherein R 1 and R 16 individually are halogen, lower alkyl, hydroxy, lower alkoxy, aralkyloxy, amino, trihalomethyl or hydrogen and R 9 is lower alkyl, aryl, hydrogen or halo-lower alkyl.
Claim 3
Dependent Claim
10 words
The compound of claim 1 wherein said compound is 4-[3-dimethylamino-2-(4-methyl-2-nitrophenyl)-2-propen-1-ylidene]-2-methyl-2-oxazolin-5-one.
Claim 4
Dependent Claim
10 words
The compound of claim 1 wherein said compound is 4-[3-dimethylamino-2-(2-nitrophenyl)-2-propen-1-ylidene]-2-methyl-2-oxazolin-5-one.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |