The present invention provides cyclic depsipeptide compounds of formula (I) wherein the stereochemical configuration of at least one carbon atom bearing the groups Cy1, Cy2, R1, R2, R3, R4, Ra and Rb is inverted compared with the naturally occurring cyclic depsipeptide PF1022A. The invention also provides compositions comprising the compounds that are effective against parasites that harm animals. The compounds and compositions may be used for combating parasites in or on mammals and birds. The invention also provides for an improved method for eradicating, controlling and preventing parasite infestation in birds and mammals.
The invention is concerned with novel hexafluoroisopropanol substituted ether derivatives of formula (I):
wherein R
1
to R
3
are as defined in the description and in the claims, as well as physiologically acceptable salts and esters thereof. These compounds bind to LXR alpha and LXR beta and can be used as medicaments.
Total Synthesis of the Cyclic Depsipeptide YM-280193, a Platelet Aggregation Inhibitor
作者:Harveen Kaur、Paul W. R. Harris、Peter J. Little、Margaret A. Brimble
DOI:10.1021/ol503507g
日期:2015.2.6
first total synthesis of YM-280193, a cyclic depsipeptide that inhibits the ADP-induced aggregation of human platelets, is described. The monomer and dipeptide fragments were prepared using conventional chemistry and subsequently assembled by Fmoc-solid-phase peptide synthesis (Fmoc-SPPS). A late-stage novel bis-alkylation–elimination of cysteine on-resin was employed to introduce the unnatural N-methyldehydroalanine
class of state-dependent voltage-gated sodium channel (NaV)1.7 inhibitors is described. By the modification of amide or urethane bond in NaV1.7 blocker III, structure-activity relationship studies that led to the identification of novel NaV1.7inhibitor 2i (DS01171986) were performed. Compound 2i exhibited state-dependent inhibition of NaV1.7 without NaV1.1, NaV1.5 or human ether-a-go-go related gene (hERG)
Expanding the utility of proteases in synthesis: broadening the substrate acceptance in non-coded amide bond formation using chemically modified mutants of subtilisin
作者:Kanjai Khumtaveeporn、Astrid Ullmann、Kazutsugu Matsumoto、Benjamin G. Davis、J.Bryan Jones
DOI:10.1016/s0957-4166(01)00024-6
日期:2001.2
strategy of combined site directed mutagenesis and chemicalmodificationcreateschemically modified mutants (CMMs) with greatly broadened substrate specificities. We have previously reported that the CMMs of subtilisinBacilluslentus (SBL) are efficient catalysts for the coupling of both l- and d-amino acids. We now report that these powerful catalysts also allow amide bond formation between a variety