Accessing the disallowed conformations of peptides employing amide-to-imidate modification
作者:Damodara N. Reddy、Ravula Thirupathi、Erode N. Prabhakaran
DOI:10.1039/c1cc13515e
日期:——
Selective modification of the C-terminal amide in peptides to dihydrooxazine (a novel stable imidate isostere) by intramolecular nucleophilic cyclo-O-alkylation of the corresponding N-(3-bromopropyl)amides results in constraining of the C-terminal residue in natively disallowed conformations both in crystals and in solution.
PRODRUGS OF CYTOTOXIC ACTIVE AGENTS HAVING ENZYMATICALLY CLEAVABLE GROUPS
申请人:BAYER PHARMA AKTIENGESELLSCHAFT
公开号:US20190077752A1
公开(公告)日:2019-03-14
The invention relates to novel prodrugs or conjugates of the general formula (Ia)
in which cytotoxic drugs, for example kinesin spindle protein inhibitors, are masked with legumain-cleavable groups and hence release the drug, and to the use of these prodrugs or conjugates for treatment and/or prevention of diseases, and to the use of these prodrugs or conjugates for production of medicaments for treatment and/or prevention of diseases, especially of hyperproliferative and/or angiogenic disorders, for example cancers.
Cleavage of esters using carbonates and bicarbonates of alkali metals: synthesis of thymopentin
作者:Karen L. Kaestle、Mohmed K. Anwer、Tapan K. Audhya、Gideon Goldstein
DOI:10.1016/s0040-4039(00)92619-4
日期:1991.1
A novel method for hydrolysis of primary esters using aqueous alkalicarbonates or bicarbonates and an alcohol as cosolvent is described. Several peptide esters, including a Cbz-Arg-Lys(Cbz)-Asp(OBzl)-Val-Tyr-OBzl (sequence corresponding to the active site of thymic immunoregulatory hormone, thymopoietin), were hydrolyzed to demonstrate the utility of this method.
Alanine Scan of [<scp>l</scp>-Dap<sup>2</sup>]Ramoplanin A2 Aglycon: Assessment of the Importance of Each Residue
作者:Joonwoo Nam、Dongwoo Shin、Yosup Rew、Dale L. Boger
DOI:10.1021/ja068573k
日期:2007.7.1
ramoplanin A2 aglycon, a potent antibiotic that inhibits bacterial cell wall biosynthesis, is detailed. As a consequence of both its increased stability (lactam vs lactone) and its "relative" ease of synthesis, the alanine scan was conducted on [Dap2]ramoplanin A2 aglycon, which possesses antimicrobial activity equal to or slightly more potent than that of ramoplanin A2 or itsaglycon. Thus, 14 key
New Helical Folds in α-Peptides with Alternating Chirality
作者:Gangavaram V. M. Sharma、Gajulapati Venkateshwarlu、Pothula Purushotham Reddy、Ajit C. Kunwar
DOI:10.1002/chem.201403164
日期:2014.9.1
In α‐peptides, the 8/10 helix is theoretically predicted to be energetically unstable and has not been experimentally observed so far. Based on our earlier studies on ‘helical induction’ and ‘hybrid helices’, we have adopted the ‘end‐capping’ strategy to induce the 8/10 helix in α‐peptides by using shortα/β‐peptides. Thus, α‐peptides containing a regular string of α‐amino acids with alternating chirality