Le reactif du titre permet laforming de liaisons N-alkyl peptidiques avec un minimum deracemisation; 示例 de copulations de BocMeX−OH et de MeY−OBzl (X et Y=Leu ou Val)
Rational design and synthesis of unsaturated 2,5-dioxopiperazine derivatives as potential protein tyrosine kinase inhibitors
摘要:
The first general method for the synthesis of a library of trifunctionalized (Z)-3-alkylidene-2,5-piperazinediones as potential protein tyrosine kinase inhibitors from commercially available amino compounds, alpha-keto acids and aldehydes using a novel cyclization/cleavage strategy on solid support is described. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
peptide synthesis (SPPS). The robustness of the allenone-mediated peptide bond formation was showcased incisively by the synthesis of carfilzomib, which involved a rare racemization-/epimerization-free N to C peptide elongation strategy. Furthermore, the successful synthesis of the model difficult peptide ACP (65–74) on a solid support suggested that this method was compatible with SPPS. This method combines
Allenone 首次被鉴定为一种高效的肽偶联剂。肽键以α-羰基乙烯基酯为关键中间体形成,其形成和随后的氨解以无外消旋/差向异构化的方式自发进行。丙二烯酮偶联试剂不仅对简单酰胺和二肽的合成有效,而且还适用于肽片段缩合和固相肽合成 (SPPS)。卡非佐米的合成充分展示了丙二烯酮介导的肽键形成的稳健性,该合成涉及一种罕见的无消旋化/差向异构化的 N 到 C 肽延伸策略。此外,在固体支持物上成功合成模型困难肽 ACP (65-74) 表明该方法与 SPPS 兼容。该方法结合了传统活性酯和偶联剂的优点,同时克服了两种策略的缺点。因此,这种丙二烯酮介导的肽键形成策略代表了肽合成的颠覆性创新。
Synthesis and Anti-Helicobacter pylori Activity of Pyloricidin Derivatives. I. Structure-activity Relationships on the Terminal Peptidic Moiety.
The novel natural antibiotics pyloricidin A, B and C possess potent and highly selective antibacterial activity against Helicobacter pylori. In order to investigate the structure activity relationships for the terminal peptidic moiety, a series of pyloricidin B and pyloricidin C derivatives, bearing various amino acids in the moiety, were prepared and evaluated for their anti-H. pylori activity. The derivatives bearing α-D-, β- and γ-amino acids or peptidemimetics showed drastically decreased activity. On the other hand, the derivatives with α-L-amino acids were found to maintain the activity. Among the derivatives prepared in this work, the allylglycine derivative 2s showed the most potent anti-H. pylori activity, with an MIC value of less than 0.006μg/ml against H. pylori NCTC11637, which is 60-fold greater than the activity of the lead compound pyloricidin C.
Synthesis of Cyclosporine. Part II. Synthesis of Boc-D-Ala-MeLeu-MeLeu-MeVal-OH, a part of the peptide sequence of cyclosporine, by different strategic ways and synthesis of its isomers Boc-D-Ala-MeLeu-D-MeLeu-MeVal-OH, Boc-D-MeLeu-DMeVal-OH, and Boc-D-Ala-MeLeu-MeLeu-D-MeVal-OH as reference compounds
作者:Roland M. Wenger
DOI:10.1002/hlca.19830660836
日期:1983.12.14
Boc-D-Ala-MeLeu-MeLeu-MeVal-OH (DLLL) and itsisomers DLDL, DLDD and DLLD were synthesized using several differentstrategic approaches and a modification of the mixed pivalic anhydride method for carboxyl activation. Alternatively, the tert-butoxy-carbonyl (Boc) or benzyloxycarbonyl (Z) amino-protecting groups and the benzyloxy (OBzl) or tert-butoxy (OtBu) carboxyl-protecting groups were used to protect
Metabolically stable apelin-analogues, incorporating cyclohexylalanine and homoarginine, as potent apelin receptor activators
作者:Kleinberg X. Fernandez、Conrad Fischer、Jennie Vu、Mahmoud Gheblawi、Wang Wang、Samantha Gottschalk、Xavier Iturrioz、Catherine Llorens-Cortés、Gavin Y. Oudit、John C. Vederas
DOI:10.1039/d1md00120e
日期:——
Cyclohexylalanine- and homoarginine-substituted apelin analogues are demonstrated to be metabolically stable APJR agonistic peptides with hypotensive effect.
respectively), and thus C-alkylated on sarcosine (Sar) moieties with MeI and allyl or PhCH2Br. The polylithiatedspecies are solubilized in THF, and their reactivity modified by excess base (lithium diisopropylamide (LDA)), by added LiCl, and/or the cosolvent N,N′-dimethylpropyleneurea (DMPU). Optimization of the reaction conditions for methylation in the cases of 7b (Table 3) and 12b (Scheme 8) gave products