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Patent US4284788A successfully refreshed from Google Patents.
US4284788A
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Imidazolidone intermediates of biotin
Assignee: Hoffmann La Roche Inc
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Filing: 1980-03-31
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Granted: 1981-08-18
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Expires: 2000-03-31
Abstract
Abstract A process is disclosed for producing imidazolidone intermediates from 2H-chromene. The intermediates are useful for synthesizing biotin.
Inventors
- 👤 Kraft Hohenlohe-Oehringen
- 👤 Anton Fliri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:13
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/04; C07D233/00; C07D233/04; C07D233/28; C07D233/30; C07D233/32; C07D495/00; C07D495/02; C07D495/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
11 words
A compound of the formula: ##STR16## wherein R 4a is azidosulphonyl.
Claim 2
Dependent Claim
11 words
A compound of the formula: ##STR16## wherein R 4a is azidosulphonyl.
Claim 3
Dependent Claim
29 words
A compound of the formula: ##STR17## wherein R 1 is hydrogen or a nitrogen protecting group selected from the group consisting of benzyl, alpha-lower alkyl substituted benzyl and allyl.
Claim 4
Dependent Claim
29 words
A compound of the formula: ##STR17## wherein R 1 is hydrogen or a nitrogen protecting group selected from the group consisting of benzyl, alpha-lower alkyl substituted benzyl and allyl.
Claim 5
Dependent Claim
10 words
The compound of claim 2 wherein R 1 is hydrogen.
Claim 6
Dependent Claim
26 words
The compound of claim 2 wherein R 1 is a nitrogen protecting group selected from the group consisting of benzyl, alpha-lower alkyl substituted benzyl and allyl.
Claim 7
Dependent Claim
12 words
The compound of claim 4 wherein the nitrogen protecting group is benzyl.
Claim 8
Dependent Claim
12 words
The compound of claim 4 wherein the nitrogen protecting group is allyl.
Claim 9
Dependent Claim
28 words
A compound of the formula: ##STR18## wherein R 1 is hydrogen or a nitrogen protecting group selected from the group consisting of benzyl, alpha-lower alkyl benzyl and allyl.
Claim 10
Dependent Claim
28 words
A compound of the formula: ##STR18## wherein R 1 is hydrogen or a nitrogen protecting group selected from the group consisting of benzyl, alpha-lower alkyl benzyl and allyl.
Claim 11
Dependent Claim
10 words
The compound of claim 7 wherein R 1 is hydrogen.
Claim 12
Dependent Claim
26 words
The compound of claim 7 wherein R 1 is a nitrogen protecting group selected from the group consisting of benzyl, alpha-lower alkyl substituted benzyl and allyl.
Claim 13
Dependent Claim
12 words
The compound of claim 9 wherein the nitrogen protecting group is benzyl.
Claim 14
Dependent Claim
12 words
The compound of claim 9 wherein the nitrogen protecting group is allyl.
References Cited (Backward Citations)
DE2508831A1
Cited
US4044020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |