Cyclopeptides derived from polymyxins and their preparation
Abstract
Abstract THE NEW CYCLOPEPTIDES OF THE FORMULA: DAB<(-DAB(-G)-Y-Z-DAB(-G)-DAB(-G)-THR-) IN WHICH Y-Z REPRESENTS AN AMINO ACID CHAIN SELECTED FROM D-LEU-THR,D-PHE-LEU, D-LEU-LEU AND D-LEU-ILEU, G REPRESENTS AN AMINO-PROTECTING RADICAL OF THE FORMULA: PY-CH(-R)-OOC- IN WHICH PY REPRESENTS PYRIDYL, PYRIDYL-N-OXIDE, OR PYRIDYL OR PYRIDYL-N-OXIDE CARRYING A METHYL SUBSTITUENT, R REPRESENTS HYDROGEN, ALKYL OF 1 TO THROUGH 5 CARBON ATOMS, OR PHENYL, AND DAB REPRESENTS A,Y-DIAMINOBUTYRIC AID, THE AMINO ACIDS HAVING THE L-CONFFIGURATION UNLESS OTHERWISE INDICATED, SAID CYCLOPEPTIDES CONTAINING ONLY A SINGLE FREE AMINO GROUP, ARE USEFUL INTERMEDIATES FOR THE SYNTHESIS OF SEMI-SYNTHETIC PRODUCTS DERIVED FROM POLYMYXINS.
Inventors
- 👤 J Bouchaudon
- 👤 G Jolles
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |