US4487726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-Methoxy-2,3,6-trimethylbenzenesulfonyl chloride
Assignee: Takeda Pharmaceutical Co Ltd
•
Filing: 1982-09-21
•
Granted: 1984-12-11
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Expires: 2002-09-21
Abstract
Abstract A guanidino group in an amino acid or a peptide can be protected with a specific group, i.e. pentamethylbenzenesulfonyl, 2,4,6-trimethoxybenzenesulfonyl, 4-methoxy-2,3,5,6-tetramethylbenzenesulfonyl, 4-methoxy-2,6-dimethylbenzenesulfonyl or 4-methoxy-2,3,6-trimethylbenzenesulfonyl, and said group may easily be removed without affecting the amino acid or the peptide to be derived from the protected amino acid or peptide. Thus, the present invention is useful in the synthesis of peptides containing the guanidino group.
Inventors
- 👤 Masahiko Fujino
- 👤 Osamu Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:05
CPC Classifications
C; C07; C07K; C07K1/00; C07K1/06; C07K1/061; C07K1/064; C07K7/00; C07K7/04; C07K7/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
2 words
4-Methoxy-2,3,6-trimethylbenzenesulfonyl chloride.
Claim 2
Dependent Claim
2 words
4-Methoxy-2,3,6-trimethylbenzenesulfonyl chloride.
References Cited (Backward Citations)
US3453099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |