Amino acids and peptides. XXVIII. Synthesis of peptide fragments related to eglin c and studies on the relationship between their structure and effects on human leukocyte elastase, cathepsin G and .ALPHA.-chymotrypsin.
摘要:
采用常规的溶液法合成了与来自家蚕血淋巴的抗蛋白酶eglin c(由70个氨基酸残基构成)相关的各种肽片段,并检验了它们对白细胞弹性蛋白酶、组织蛋白酶G和α-胰凝乳蛋白酶的抑制效应。其中,H-Arg-Glu-Tyr-Phe-OMe(eglin c 22-25)和H-Ser-Pro-Val-Thr-Leu-Asp-Leu-Arg-Tyr-OMe(eglin c 41-49)能抑制组织蛋白酶G和α-胰凝乳蛋白酶,但不能抑制白细胞弹性蛋白酶,而H-Thr-Asn-Val-Val-OMe(eglin c 60-63)能抑制白细胞弹性蛋白酶,但不能抑制组织蛋白酶G或α-胰凝乳蛋白酶,尽管eglin c对白细胞弹性蛋白酶、组织蛋白酶G和α-胰凝乳蛋白酶都具有强抑制作用。这些结果提示,eglin c与白细胞弹性蛋白酶、组织蛋白酶G和α-胰凝乳蛋白酶的相互作用部位可能各不相同。
The first total synthesis of cis,cis-ceratospongamide (cyclo[l-Pro-l-Ile-Me-oxazoline-l-Phe-l-Pro-thiazole-l-Phe-]) was accomplished and confirmed by X-ray crystal analysis. The heating of cis,cis-ceratospongamide in DMSO converted it not to the trans,trans isomer but to the trans,trans-[d-allo-Ile]-ceratospongamide, which was confirmed by total synthesis. Its solution conformation was constructed
Synthesis of Cyclic Peptidomimetics via a Pd-Catalyzed Macroamination Reaction
作者:Brett A. Hopkins、Graham F. Smith、Nunzio Sciammetta
DOI:10.1021/acs.orglett.6b01961
日期:2016.8.19
A new method to access cyclicpeptidomimetics via a Pd-catalyzed macroamination reaction is presented. Natural amino acid amines are revealed as proficient coupling partners in these transformations. With a commercially available CPhos G3 catalyst system and substrates bearing diverse amino acid and aryl halide backbones, the unique head to side-chain (or side-chain mimic) macrocycles are afforded
Chemoselective Peptide Backbone Diversification and Bioorthogonal Ligation by Ruthenium‐Catalyzed C−H Activation/Annulation
作者:Liangliang Song、Gerardo M. Ojeda‐Carralero、Divyaakshar Parmar、David A. González‐Martínez、Luc Van Meervelt、Johan Van der Eycken、Jan Goeman、Daniel G. Rivera、Erik V. Van der Eycken
DOI:10.1002/adsc.202100323
日期:2021.7
The field of peptide derivatization by metal-catalyzed C−H activation has been mostly directed to modify the side chains, but poor attention has been given to the peptide backbone. Here we report a ruthenium-catalyzed C−H activation/annulation process that can chemoselectively modify the peptide backbone producing functionalized isoquinolone scaffolds with high regioselectivity in a rapid and step-economical
Copper-Catalyzed Chemodivergent Synthesis of Oxazoles and Imidazolidones by Selective C–O/C–N Cyclization
作者:Jian Tang、Fengjie Lu、Xinyi Zhang、Yiming Su、Ensheng Zhang、Zhiyu Yang
DOI:10.1021/acs.joc.3c00505
日期:2023.7.21
Efficient synthesis of phenylalanine-derived oxazoles and imidazolidones can be achieved by copper-catalyzed reactions that are controlled by directing groups and proceed by selective C–O or C–Ncoupling. This strategy employs inexpensive commercial copper catalysts and readily available starting materials. It uses a convenient reaction procedure and provides a reliable approach to the versatile and