Solid-phase based synthesis of biologically promising triazolyl aminoacyl (peptidyl) penicillins

Synthetic Strategies Towards the Generation of Penicillin-Containing Hybrids in the Search for Anticancer Activity

An extended library of hybrids that combined a penicillin derivative with a peptoid moiety was designed and synthetized using either a solid-phase or a mixed solid-phase/solution-phase strategy. The library was further evaluated for antiproliferative activity. While none of the different synthesized compounds showed significant cytotoxicity against a normal cell line, tumor cell results drew several conclusions, when comparing with our reference, the highly active triazolylpeptidyl penicillin derivative, TAF7f. Thus, when the 1,2,3-triazole group was exchanged by its "retro-inverse" analogue, no change was noted in the activity of the hybrids; however, better performance was generally obtained if the triazole is replaced by a glycine moiety. Additionally, the absence of hydrogen bond donor groups decreased the compounds activity, which could explain that, in general, this set of derivatives were less active than their peptide-containing analogues. From this study, is indisputable that, regardless of the type of chain (peptide, peptoid or mixture) attached to penicillin, an isobutyl side chain placed in the position closest to penicillin and a benzyl in the next position are determinant for the activity.

Design, synthesis and cytotoxic evaluation of peptoid analogs of an anticancer active triazolylpeptidyl penicillin

Aim: Encouraged by the antitumor activity exhibited by triazolylpeptidyl penicillins, we decided to synthesize and evaluate a library of peptoid analogs. Results: The replacement of the dipeptide unit of the reference compound, TAP7f, was investigated. In addition, the effect of the triazole linking group on the biological activity of these new derivatives was evaluated, exchanging it with a glycine spacer. The cytotoxic effect of the library compounds was determined in the B16-F0 cell line and compared with the effects on normal murine mammary gland cells. Conclusion: Among the tested compounds, peptoid 4e exhibited the highest antiproliferative activity.

Antitumor activity of new chemical compounds in triple negative mammary adenocarcinoma models

AIM

According to the need for the development of new anticancer agents, we have synthetized novel bioactive compounds and aimed to determine their antitumor action.

MATERIALS & METHODS

We describe in vitro studies evaluating the effect of 35 novel chemical compounds on two triple negative murine mammary adenocarcinoma tumors.

RESULTS & CONCLUSION

Three compounds were selected because of their high antitumor activity and their low toxicity to normal cells. Their effect on tumor cells apoptosis, clonogenicity and migratory capacity, were determined. We found that the selected compounds showed inhibition of viability and clonogenic capacity, and promotion of apoptosis. They also decreased the migratory capacity of tumor cells. The results obtained suggest the likelihood of their future use as antitumor and/or antimetastatic agents.

Molecular Diversity by Olefin Cross-Metathesis on Solid Support. Generation of Libraries of Biologically Promising β-Lactam Derivatives

The application of the reagent-based diversification strategy for generation of libraries of biologically promising β-lactam derivatives is described. Key features are the versatility of the linker used and the cross-metathesis functionalization at the cleavage step. From an immobilized primary library, diversity was expanded by applying different cleavage conditions, leading to a series of cholesterol absorption inhibitor analogues together with interesting hybrid compounds through incorporation of a chalcone moiety.

Synthesis of Side-Chain Modified Peptides Using Iterative Solid Phase ‘Click' Methodology

A series of side-chain modified peptides have been prepared via an iterative sequence of peptide couplings and azide–alkyne cycloadditions (‘click’ reactions) using Fmoc-solid phase peptide synthesis. This efficient modular synthetic route allows the systematic and sequential incorporation of a variety of side-chain modifications onto short peptides. The versatility of this approach was demonstrated by the synthesis of a series of short peptides with appended anion recognition motifs and fluorescent indicators.

CuAAC: An Efficient Click Chemistry Reaction on Solid Phase

Click chemistry is an approach that uses efficient and reliable reactions, such as Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC), to bind two molecular building blocks. CuAAC has broad applications in medicinal chemistry and other fields of chemistry. This review describes the general features and applications of CuAAC in solid-phase synthesis (CuAAC-SP), highlighting the suitability of this kind of reaction for peptides, nucleotides, small molecules, supramolecular structures, and polymers, among others. This versatile reaction is expected to become pivotal for meeting future challenges in solid-phase chemistry.

Very efficient and broad-in-scope palladium-catalyzed Hiyama cross-coupling. The role of water and copper(i) salts

A very high-yielding Pd-catalyzed cross-coupling between aryl halides and aryl(trialkoxy)silanes is achieved in the presence of Cu(i) and a measured amount of water.

Palladium-catalyzed cross-coupling reactions of arylsiloxanes with aryl halides: application to solid-supported organic synthesis

The solid-phase version of the Pd-catalyzed Hiyama reaction between a variety of aryltriethoxysilanes and immobilized aryl halides was developed. Smooth cross-coupling was achieved to afford the corresponding biaryl products in moderate to excellent yields. The described protocol would be particularly useful for the construction of 4'-substituted 1,1'-biphenyl derivatives.