formation remains a critical aspect of N‐methylated peptide synthesis. In this study, we synthesized a variety of dipeptides in high yields, without severe racemization, from equivalent amounts of amino acids. Highly reactive N‐methylimidazolium cation species were generated in situ to accelerate the amidation. The key to success was the addition of a strong Brønsted acid. The developed amidation enabled
Peptide/Peptoid Hybrid Oligomers: The Influence of Hydrophobicity and Relative Side-Chain Length on Antibacterial Activity and Cell Selectivity
作者:Nicki Frederiksen、Paul R. Hansen、Fredrik Björkling、Henrik Franzyk
DOI:10.3390/molecules24244429
日期:——
relationships within a subclass of oligomers displaying variation of three structural features: (i) cationic side-chain length, (ii) hydrophobic side-chain length, and (iii) type of residue that is of a flexible peptoid nature. Increased side-chain length of cationic residues led to reduced hydrophobicity till the side chains became more extended than the aromatic/hydrophobic side chains, at which point
Provided are modulators of TLRs of Formula II:
pharmaceutically acceptable salts thereof, compositions containing such compounds, and therapeutic methods that include the administration of such compounds.
提供了公式II的TLR调节剂:其药用盐,含有这类化合物的组合物,以及包括给予这类化合物的治疗方法。
Synthesis of nonpolar peptide nucleic acid monomers containing fluoroaromatics
A general strategy for the synthesis of nonpolar peptide nucleic acid monomers containing fluoroaromatics (F-PNA) is described. These compounds have been designed as hybrid analogues of the difluorotoluene nucleoside, F (1) with PNA. Fluorophenylacetic acid derivatives 9 were coupled to the Boc-protected pseudopeptide backbone 8 by a standard peptide coupling reaction using DhbtOH and DCC in the presence of triethylamine to afford the doubly protected F-PNA monomers 14 in moderate to good yields. The ethyl esters 14a, 14c and 14e underwent hydrolytic cleavage under basic conditions to generate N-protected F-PNA monomers 15 in good
yields. The tert-butyl esters 14b, 14d were treated with TFA in dichloromethane to produce the free F-PNA monomers 16 in good to excellent yields. The β-F-PNA monomers designed based on the structure of 2′,5′-linked isoDNA were also synthesized in a similar fashion to the preparation of F-PNA monomers in moderate to good yields as both N-protected and free monomers.
Provided are modulators of TLRs of Formula II:
pharmaceutically acceptable salts thereof, compositions containing such compounds, and therapeutic methods that include the administration of such compounds.
所提供的是式 II 的 TLR 调节剂:
其药学上可接受的盐、含有此类化合物的组合物以及包括施用此类化合物的治疗方法。