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Patent US4663443A successfully refreshed from Google Patents.
US4663443A
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N-substituted neuraminic acid derivatives
Assignee: KANTO ISHI PHARMACEUTICAL CO Ltd
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Filing: 1985-05-01
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Granted: 1987-05-05
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Expires: 2005-05-01
Abstract
Abstract This invention provides a novel compound having a formula such as ##STR1## This invention also provides a process for preparing such a compound. The novel compound has an excellent immunological activity.
Inventors
- 👤 Shohei Shibayama
- 👤 Shoji Yoshimura
- 👤 Masayoshi Ito
- 👤 Yoshiyasu Shitori
- 👤 Tomoya Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:04
CPC Classifications
C; C07; C07H; C07H11/00; C07H15/00; C07H15/02; C07H15/04; A; A61; A61P; A61P37/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
38 words
An N-substituted neuraminic acid compound of the formula: ##STR39## wherein R 1 is hydrogen or acetyl; and A is an amino acid residue having CO-- and N-radicals to which --NH and ##STR40## of the above formula bond respectively.
Claim 2
Dependent Claim
38 words
An N-substituted neuraminic acid compound of the formula: ##STR39## wherein R 1 is hydrogen or acetyl; and A is an amino acid residue having CO-- and N-radicals to which --NH and ##STR40## of the above formula bond respectively.
Claim 3
Dependent Claim
60 words
A compound as set forth in claim 1 wherein A in the formula has the following formula: ##STR41## wherein R 2 is selected from the group consisting of ##STR42## R 3 is hydrogen or R 2 and R 3 form the ring selected from ##STR43## together with carbon atom and nitrogen atom to which R 2 and R 3 bond.
Claim 4
Dependent Claim
35 words
An N-substituted neuraminic acid compound of of the formula: ##STR44## wherein R 1 is hydrogen or acetyl; and A' is an amino acid residue having a CO-radical to which --NH of the above formula bonds.
Claim 5
Dependent Claim
35 words
An N-substituted neuraminic acid compound of of the formula: ##STR44## wherein R 1 is hydrogen or acetyl; and A' is an amino acid residue having a CO-radical to which --NH of the above formula bonds.
Claim 6
Dependent Claim
80 words
A compound as set forth in claim 3 wherein A' in the formula has the following formula: ##STR45## wherein R 4 is selected from the group consisting of ##STR46## wherein BZ1 is --CH 2 C 6 H 5 and CBZ is C 6 H 5 CH 2 OC--; and R 5 is hydrogen or R 4 and R 5 form the ring selected from ##STR47## together with carbon atom and nitrogen atom to which R 4 and R 5 bond.
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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |