Category: 71989-31-6

Handoko published the artcileTwo-component redox organocatalyst for peptide bond formation, COA of Formula: C20H19NO4, the publication is Journal of the American Chemical Society (2022), 144(8), 3637-3643, database is CAplus and MEDLINE.

Peptides are fundamental therapeutic modalities whose sequence-specific synthesis can be automated. Yet, modern peptide synthesis remains atom uneconomical and requires an excess of coupling agents and protected amino acids for efficient amide bond formation. We recently described the rational design of an organocatalyst that can operate on Fmoc (Fmoc = 9-fluorenylmethoxycarbonyl) amino acids-the standard monomers in automated peptide synthesis (J.Am.Chem.Soc.2019, 141, 15977). The catalytic cycle centered on the conversion of the carboxylic acid to selenoester, which was activated by a hydrogen bonding scaffold for amine coupling. The selenoester was generated in situ from a diselenide catalyst and stoichiometric amounts of phosphine. Although the prior system catalyzed oligopeptide synthesis on solid phase, it had two significant requirements that limited its utility as an alternative to coupling agents-it depended on stoichiometric amounts of phosphine and required mol. sieves as dehydrating agent. Here, we address these limitations with an optimized method that requires only catalytic amounts of phosphine and no dehydrating agent. The new method utilizes a two-component organoreductant/organooxidant-recycling strategy to catalyze amide bond formation.

Journal of the American Chemical Society published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, COA of Formula: C20H19NO4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Vanjari, Rajeshwer published the artcileGold(I)-mediated rapid cyclization of propargylated peptides via imine formation, Category: catalysis-chemistry, the publication is Journal of the American Chemical Society (2022), 144(11), 4966-4976, database is CAplus and MEDLINE.

In fundamental research and drug discovery, there is still a need for effective and straightforward chem. approaches for generating cyclic peptides. The divergent synthesis of cyclic peptides remains a challenge, in particular when cyclization is carried out in the presence of unprotected side chains and a nonpeptidic component within the cycle is needed. Herein, we describe a novel and efficient strategy based on Au(I)-mediated cyclization of unprotected peptides through rapid (30-60 min) amine addition on a propargyl group to generate an imine linkage. Mechanistic insights reveal that the reaction proceeds via regioselective Markovnikov’s addition of the amine on the Au(I)-activated propargyl. This strategy was successfully applied to prepare efficiently (56-94%) over 35 diverse cyclic peptides having different sequences and lengths. We have also achieved stereoselective reduction of cyclic imines employing chiral ligands. The practicality of our method was extended for the synthesis of cyclic peptides that bind Lys48-linked di-ubiquitin chains with high affinity, leading to apoptosis of cancer cells.

Journal of the American Chemical Society published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C13H19N5OS, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Adams, Gregory L. published the artcileDevelopment of ProTx-II analogs as highly selective peptide blockers of Na_v1.7 for the treatment of pain, HPLC of Formula: 71989-31-6, the publication is Journal of Medicinal Chemistry (2022), 65(1), 485-496, database is CAplus and MEDLINE.

Inhibitor cystine knot peptides, derived from venom, have evolved to block ion channel function but are often toxic when dosed at pharmacol. relevant levels in vivo. The article describes the design of analogs of ProTx-II that safely display systemic in vivo blocking of Na_v1.7, resulting in a latency of response to thermal stimuli in rodents. The new designs achieve a better in vivo profile by improving ion channel selectivity and limiting the ability of the peptides to cause mast cell degranulation. The design rationale, structural modeling, in vitro profiles, and rat tail flick outcomes are disclosed and discussed.

Journal of Medicinal Chemistry published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, HPLC of Formula: 71989-31-6.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Xia, Yiran published the artcileFmoc-protected amino acids as luminescent and circularly polarized luminescence materials based on charge transfer interaction, Synthetic Route of 71989-31-6, the publication is Chinese Chemical Letters (2022), 33(11), 4918-4923, database is CAplus.

Fluorenylmethyloxycarbonyl (Fmoc)-protected amino acids are effective building blocks in self-assembled architectures at hierarchical levels, which however show limited luminescent properties and chiroptical activities. Here we introduce a charge-transfer strategy to build two-component luminescent materials with emerged circularly polarized luminescence properties. A library of Fmoc-amino acids was built, which selectively form charge-transfer complexes with the electron-deficient acceptor. Embedding in amorphous polymer matrix or phys. grinding could trigger the charge-transfer luminescence with adjusted wavelengths in a general manner. X-ray diffraction results suggest the multiple binding modes between donor and acceptor. And, the solution-processed coassembly could selectively exhibit circularly polarized luminescence with high dissymmetry g-factors. This work illustrates a noncovalent charge-transfer strategy to construct luminescent and chiroptical organic composites based on the easy-accessible and economic chiral N-terminal aromatic amino acids.

Chinese Chemical Letters published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C7H3BrF3I, Synthetic Route of 71989-31-6.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Cheng, Qiuhong published the artcileEutectogels as Matrices to Manipulate Supramolecular Chirality and Circularly Polarized Luminescence, HPLC of Formula: 71989-31-6, the publication is ACS Nano (2022), 16(4), 6825-6834, database is CAplus and MEDLINE.

The occurrence and manipulation of supramol. chirality in deep eutectic solvents (DESs) was explored. Transfer from inherent chiral DES to solutes in either aggregated or monomeric building units is blocked. The chiral assembly of ¦Ð-conjugated amino acids was realized. Compared to aqueous media, self-assembly in DES hinders the spontaneous structural and chirality evolution that benefit from efficient solvation, where the ¦Ð-conjugated amino acids were involved as H bonding donors. DES performs as a dye-friendly matrix to afford chiroptical eutectogels with tunable circularly polarized luminescence, whereby a large dissymmetry g-factor of ¡Ü0.015 was realized. DES behaves as feasible and flexible solvents to fabricate and stabilize functional soft chiral self-assemblies with controllable chiroptical properties.

ACS Nano published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, HPLC of Formula: 71989-31-6.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Yang, Yi published the artcileOptimized Fmoc-removal strategy to suppress the traceless and conventional diketopiperazine formation in solid-phase peptide synthesis, Category: catalysis-chemistry, the publication is ACS Omega (2022), 7(14), 12015-12020, database is CAplus and MEDLINE.

DKP (diketopiperazine) formation is a ubiquitous side reaction in SPPS (solid-phase peptide synthesis) that is highly sequence-dependent. Secondary amino acids are extremely prone to host such a side reaction. DKP formation is predominantly induced at the Fmoc (Fmoc = fluorenylmethyloxycarbonyl) removal step mediated by a secondary amine, which conventionally employs piperidine/DMF (dimethylformamide). In this study, alternative Fmoc-removal solution 2% DBU (1,8-diazabicyclo[5.4.0]undec-7-ene)/5% piperazine/NMP (N-methyl-2-pyrrolidone) led to drastic DKP reduction relative to 20% piperidine/DMF.

ACS Omega published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C14H12N2S, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Beudert, Matthias published the artcileMerging bioresponsive release of insulin-like growth factor I with 3D printable thermogelling hydrogels, Related Products of catalysis-chemistry, the publication is Journal of Controlled Release (2022), 115-126, database is CAplus and MEDLINE.

3D Printing of biomaterials enables spatial control of drug incorporation during automated manufacturing This study links bioresponsive release of the anabolic biol., insulin-like growth factor-I (IGF-I) in response to matrix metalloproteinases (MMP) to 3D printing using the block copolymer of poly(2-methyl-2-oxazoline) and thermoresponsive poly(2-n-propyl-2-oxazine) (POx-b-POzi). For that, a chemo-enzymic synthesis was deployed, ligating IGF-I enzymically to a protease sensitive linker (PSL), which was conjugated to a POx-b-POzi copolymer. The product was blended with the plain thermogelling POx-b-POzi hydrogel. MMP exposure of the resulting hydrogel triggered bioactive IGF-I release. The bioresponsive IGF-I containing POx-b-POzi hydrogel system was further detailed for shape control and localized incorporation of IGF-I via extrusion 3D printing for future applications in biomedicine and biofabrication.

Journal of Controlled Release published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, Related Products of catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Vastakaite, Greta published the artcilePeptide-Catalyzed Stereoselective Conjugate Addition Reaction of Aldehydes to C-Substituted Maleimides, HPLC of Formula: 71989-31-6, the publication is Chemistry – A European Journal (2022), 28(18), e202200215, database is CAplus and MEDLINE.

Catalytic stereoselective additions with maleimides I (R = C₆H₅, 4-ClC₆H₄, 2-BrC₆H₄, etc.) are useful one-step reactions to yield chiral succinimides II (R¹ = CH₃, CH₂CH₃, CH₂C₆H₅, etc.), mols. that are widespread among therapeutically active compounds but challenging to prepare when the maleimide is C-substituted. The tripeptide H-Pro-Pro-Asp-NHC₁₂H₂₅ as a catalyst for conjugate addition reactions between aldehydes R¹CH₂CHO and C-substituted maleimides I to form succinimides II with three contiguous stereogenic centers in high yields and stereoselectivities has been described. The peptidic catalyst is so chemoselective that no protecting group is needed at the imide nitrogen of the maleimides I. Derivatization of the succinimides was straightforward and provided access to chiral pyrrolidines, lactones e.g., III, and lactams. Kinetic studies, including a Hammett plot, provided detailed insight into the reaction mechanism.

Chemistry – A European Journal published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C6H10N2, HPLC of Formula: 71989-31-6.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Narode, Hanuman published the artcileVanillin containing 9H-fluoren sulfone scaffolds: Synthesis, biological evaluation and molecular docking study, Product Details of C20H19NO4, the publication is Results in Chemistry (2022), 100269, database is CAplus.

Vanillin containing 9H-fluoren sulfone scaffolds I [R = Fmoc-Gly, Fmoc-Pro, Fmoc-Phe, etc.] were prepared by coupling a sulfone amine with carboxylic acid group of amino acids in presence of peptide coupling reagent hexafluorophosphate benzotriazole tetra-Me uronium (HBTU). All eight compounds I synthesized vanillin containing 9H-fluoren sulfone scaffolds were evaluated for their biol. activities, namely, antibacterial, antifungal and antimalarial. The antibacterial evaluation revealed that compounds I [R = Fmoc-Ala, Fmoc-Ser(t-Bu), Fmoc-Pro, Fmoc-Leu, Fmoc-D-Val, Fmoc-Met] exhibited potency against tested pathogenic bacteria, especially against Staphylococcus aureus. Compounds I [R = Fmoc-Ala, Fmoc-Val, Fmoc-Phe] manifested considerable antifungal activities against Candida albicans, Aspergillus niger and A. clavatus. Moreover, the antimalarial result demonstrated excellent antimalarial activities for compounds I [R = Fmoc-Ala, Fmoc-Val] against Plasmodium falciparum with IC₅₀ less than the standard quinine. Further, mol. docking study was performed to find mol. level interaction of compounds with malarial drug target enzyme P. falciparum dihydrofolate reductase-thymidylate synthase (pfdher-ts). Interestingly, for all tested sulfone scaffolds the docking energy was found between -8.6 to -10.6 kcal/mol, which was higher than both of the standard drugs’ (quinine and chloroquine) docking energy, i.e. -8.4 and -6.9, resp. The results of this study confirmed the importance of the sulfone class of compounds in the treatment of parasitic infections and microbial infections.

Results in Chemistry published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, Product Details of C20H19NO4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Chaudhuri, Dipankar published the artcileChemical synthesis of a potent antimicrobial peptide Murepavadin using a tandem native chemical ligation/desulfurization reaction, COA of Formula: C20H19NO4, the publication is Journal of Organic Chemistry (2021), 86(21), 15242-15246, database is CAplus and MEDLINE.

Classical approaches for the backbone cyclization of polypeptides require conditions that may compromise the chirality of the C-terminal residue during the activation step of the cyclization reaction. Here, we describe an efficient epimerization-free approach for the Fmoc-based (Fmoc = 9-fluorenyl-methoxycarbonyl) synthesis of murepavadin using intramol. native chem. ligation in combination with a concomitant desulfurization reaction. Using this approach, bioactive murepavadin was produced in a good yield in two steps. The synthetic peptide antibiotic showed potent activity against different clin. isolates of P. aeruginosa. This approach can be easily adapted for the production of murepavadin analogs and other backbone-cyclized peptides.

Journal of Organic Chemistry published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, COA of Formula: C20H19NO4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia