A base labile protecting group for peptide synthesis: 2,2 -Bis(4′-nitrophenyl)ethan-1-oxycarbonyl urethanes
摘要:
A base labile urethane (Bnpeoc) group derived from 2,2-bis(4'-nitrophenyl)ethan-1-ol has been developed as an amine protecting group. This protecting group may be cleaved using the reagents, DBN, DBU, DBU/HOAc and piperidine. The preparations of N-alpha-Bnpeoc amino acids and applications to peptide/glycopeptide synthesis are described.
A base labile protecting group for peptide synthesis: 2,2 -Bis(4′-nitrophenyl)ethan-1-oxycarbonyl urethanes
摘要:
A base labile urethane (Bnpeoc) group derived from 2,2-bis(4'-nitrophenyl)ethan-1-ol has been developed as an amine protecting group. This protecting group may be cleaved using the reagents, DBN, DBU, DBU/HOAc and piperidine. The preparations of N-alpha-Bnpeoc amino acids and applications to peptide/glycopeptide synthesis are described.
New labile protecting groups for the anticipated synthesis of oligoribonucleotides were developed and introduced via their carbonochloridates 8 – 11 at the 5′-O position of thymidine (15) to form 16, 18, 21, and 24 in good yields (Schemes 2 and 3). Similarly, the 5′-O-diphenylphosphinoyl(dpp)-protected thymidine derivative 27 was synthesized with diphenylphosphinoyl chloride 14 as the reactive reagent
Der zweistufige Carbanion-Mechanismus der Fragmentierung von 3-Aminopropylbenzoaten. Fragmentierungs-Reaktionen. 25. Mitteilung
作者:C. A. Grob、F. M. Unger、E. D. Weiler、A. Weiss
DOI:10.1002/hlca.19720550221
日期:1972.1.31
The unsubstituted and p-substituted benzoates 2b–2e of 3-dimethylamino-2,2bis(p-nitrophenyl)-propanol (2a) undergo quantitative fragmentation in 80% ethanol yielding 1,1-bis(p-nitrophenyl)-ethylene (5) besides formaldehyde and dimethylamine, the hydrolysis products of the imonium ion 3. The corresponding alcohol 2a, however, yields 2,2-bis(p-nitrophenyl)-ethanol (9) in addition to fragmentation products
PRODRUGS AND DRUG-MACROMOLECULE CONJUGATES HAVING CONTROLLED DRUG RELEASE RATES
申请人:PROLYNX LLC
公开号:US20140296476A1
公开(公告)日:2014-10-02
The present invention provides methods and compositions that permit controlled and prolonged drug release in vivo. The compounds are either prodrugs with tunable rates of release, or conjugates of the drug with macromolecules which exhibit tunable controlled rates of release.