Development of Macrocyclic Peptides Containing Epoxyketone with Oral Availability as Proteasome Inhibitors
摘要:
Macrocyclization has been frequently utilized for optimizing peptide or peptidomimetic-based compounds. In an attempt to obtain potent, metabolically stable, and orally available proteasome inhibitors, 30 oprozomib-derived macrocyclic peptides with structural diversity in their N-terminus and linker were successively designed and synthesized for structure- activity relationship (SAR) studies. As a consequence, the macrocyclic peptides with N-methyl-pyrazole (24p, 24x), imidazole (24t), and pyrazole (24v) as their respective N-termini exhibited favorable in vitro activity and metabolic stability, which translated into their potent in vivo proteasome inhibitory activity after oral administration. In particular, compound 24v, as the most distinguished one among this series, displayed excellent chymotrypsin-like (ChT-L, beta 5) inhibitory potency (IC50 = 16 nM), low nanomolar antiproliferative activity against all three of the tested cell lines, and superior metabolic stability in mouse liver microsome (MLM), as well as favorable inhibition against ChT-L compared to that of oprozomib in BABL/c mice following po administration at a comparatively low dose, thereby representing a promising candidate for further development.
Repurposing the 3‐Isocyanobutanoic Acid Adenylation Enzyme SfaB for Versatile Amidation and Thioesterification
作者:Mengyi Zhu、Lijuan Wang、Jing He
DOI:10.1002/anie.202010042
日期:2021.1.25
molecules with novel skeletons, but also to identify the enzymes that catalyze diverse chemical reactions. Exploring the substrate promiscuity and catalytic mechanism of those biosynthetic enzymes facilitates the development of potential biocatalysts. SfaB is an acyladenylate‐forming enzyme that adenylates a unique building block, 3‐isocyanobutanoic acid, in the biosynthetic pathway of the diisonitrile
Low Catalyst Loading in Ring-Closing Metathesis Reactions
作者:Renat Kadyrov
DOI:10.1002/chem.201202207
日期:2013.1.14
conversion into a broad variety of 5–16‐membered heterocyclic compounds. The practicality of this procedure was illustrated in the synthesis of 5–8‐membered N‐tert‐butoxycarbonyl (N‐Boc)‐ and N‐para‐toluenesulfonyl (N‐Ts)‐protected cyclic amines and 9–16‐membered lactones. The synthesis of macrocyclic proline‐based lactams required slightly higher catalyst loadings. Along with monocyclic products, oligomeric
描述了一种有效的闭环复分解反应程序。在几分钟内可以达到95%的二烯丙基丙二酸二乙酯在稀溶液中的转化率,达到TOF = 4173 min -1,而载有不饱和NHC配体的商业化Ru催化剂的负载量却非常低。通常,仅需50至250 ppm的催化剂即可将近定量转化为多种5-16元杂环化合物。此过程的实用性在5-8元的合成图示ñ -叔丁氧羰基(Ñ -Boc) -和ñ -对甲苯磺酰(Ñ-Ts)保护的环胺和9-16元内酯。大环脯氨酸基内酰胺的合成需要稍高的催化剂负载量。与单环产物一起,分离并表征了寡聚副产物,主要是环二聚体。
Synthesis of cyclic β-turn mimics from l-Pro-Phe/Phe-l-Pro derived di- and tripeptides via ring closing metathesis: the role of chirality of the Phe residue during cyclization
作者:Biswadip Banerji、Madhushree Bhattacharya、Rajesh B Madhu、Saibal Kumar Das、Javed Iqbal
DOI:10.1016/s0040-4039(02)01238-8
日期:2002.9
o-Gly-N-allyl/pent-4-enoyl-Gly-Pro-Phe-N-allyl amide derived di- and tripeptides can be cyclized leading to β-turnmimicsvia ring closing metathesis using Grubbs’ catalyst. The chirality of the Phe residue in these di- and tripeptides controls the cyclization during ring closing metathesis. The presence of pent-4-enoyl and allyl groups at the termini of these peptides leads to the concomitant formation
Method For Enrichment Involving Elimination By Mismatch Hybridisation
申请人:Freskgard Per-Ola
公开号:US20090239211A1
公开(公告)日:2009-09-24
The present invention relates to a method for selecting a molecule from a library of such molecules associated with identifier oligonucleotides, said molecule having affinity towards a target. The method involves contacting library with a target to allow for an interaction between the molecules and the target and partitioning a fraction enriched in identifier oligonucleotides of molecules interacting with the target. After an optional nucleic acid amplification of the partitioned fraction, the fraction is subjected to conditions at which hetero-duplexes and homo-duplexes are formed. The homo-duplexes are subsequently recovered and decoded to identify the identity of the molecule interacting with the target.
METHOD FOR PRODUCING SECOND-GENERATION LIBRARY
申请人:FRESKGARD Per-Ola
公开号:US20120028812A1
公开(公告)日:2012-02-02
The present invention relates to a method for generating a second-generation library. In a first step, a library of encoded molecules associated with an identifier nucleic acid comprising codons identifying chemical entities that have participated in the formation of the encoded molecule is provided. In a second step, the library is partitioned and encoded molecules having a certain property are selected. Codons of identifiers of selected encoded molecules are subsequently identified, and a second-generation library is prepared using at least some of the chemical entities coded for by the identified codons. The new focussed library may be used for another partition step to select encoded molecules with a certain property.