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US4694076A
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Sialic acid derivatives
Assignee: KANTO ISHI PHARMACEUTICAL Co Ltd NO 1-1 NISHI SHINJUKU 2-CHOME SHINJUKU-KU TOKYO JAPAN
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Filing: 1984-12-11
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Granted: 1987-09-15
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Expires: 2004-12-11
Abstract
Abstract Sialic acid derivatives of the formula: ##STR1## wherein R 1 is hydrogen, trityl, or acyl, R 2 is hydrogen or acyl, R 3 and R 4 are individually glycerolglycoside, dialkylglycerol, alkoxycarbonyl or carboxyl. These compounds may be employed as a useful intermediate for the synthesis of biologically active substances and may be employed as an inhibitor of hydrolytic enzyme, a reagent for affinity chromatography for purifying enzyme, or a synthetic antigen.
Inventors
- 👤 Tomoya Ogawa
- 👤 Mamoru Sugimoto
- 👤 Yoshiyasu Shitori
- 👤 Masayoshi Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:42
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/02; C07H15/04; A; A61; A61P; A61P37/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
45 words
A sialic acid derivative of the formula: ##STR19## wherein R 1 is hydrogen, trityl, or acetyl, R 2 is hydrogen or acetyl, one of R 3 and R 4 is carboxyl, methoxycarbonyl or ethoxycarbonyl, and the other of R 3 and R 4 is ##STR20##
Claim 2
Dependent Claim
45 words
A sialic acid derivative of the formula: ##STR19## wherein R 1 is hydrogen, trityl, or acetyl, R 2 is hydrogen or acetyl, one of R 3 and R 4 is carboxyl, methoxycarbonyl or ethoxycarbonyl, and the other of R 3 and R 4 is ##STR20##
Claim 3
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR21## wherein Ac is acetyl.
Claim 4
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR22## wherein Ac is acetyl.
Claim 5
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR23## wherein Ac is acetyl.
Claim 6
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR24## wherein Ac is acetyl.
Claim 7
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR25## wherein Ac is acetyl.
Claim 8
Dependent Claim
19 words
The sialic acid derivative of claim 1 of the formula: ##STR26## wherein Ac is acetyl, and Tr is trityl.
Claim 9
Dependent Claim
19 words
The sialic acid derivative of claim 1 of the formula: ##STR27## wherein Ac is acetyl, and Tr is trityl.
Claim 10
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR28## wherein Ac is acetyl.
Claim 11
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR29## wherein Ac is acetyl.
Claim 12
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR30## wherein Ac is acetyl.
Claim 13
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR31## wherein Ac is acetyl.
Claim 14
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR32## wherein Ac is acetyl.
Claim 15
Dependent Claim
15 words
The sialic acid derivative of claim 1 of the formula: ##STR33## wherein Ac is acetyl.
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) | 1990-09-14 | 1991-03-16 | 1991-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-14 | 1995-03-16 | 1995-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-14 | 1999-03-16 | 1999-09-15 | $7700.00 | Window Closed / Lapsed |