Naphthoquinones as Covalent Reversible Inhibitors of Cysteine Proteases—Studies on Inhibition Mechanism and Kinetics
作者:Philipp Klein、Fabian Barthels、Patrick Johe、Annika Wagner、Stefan Tenzer、Ute Distler、Thien Anh Le、Paul Schmid、Volker Engel、Bernd Engels、Ute A. Hellmich、Till Opatz、Tanja Schirmeister
DOI:10.3390/molecules25092064
日期:——
investigation of a class of highly potent protease inhibitors based on 1,4-naphthoquinones with a dipeptidic recognition motif (HN-l-Phe-l-Leu-OR) in the 2-position and an electron-withdrawing group (EWG) in the 3-position is presented. One of the compound representatives, namely the acid with EWG = CN and with R = H proved to be a highly potent rhodesain inhibitor with nanomolar affinity. The respective benzyl
Amide Synthesis by Nickel/Photoredox‐Catalyzed Direct Carbamoylation of (Hetero)Aryl Bromides
作者:Nurtalya Alandini、Luca Buzzetti、Gianfranco Favi、Tim Schulte、Lisa Candish、Karl D. Collins、Paolo Melchiorre
DOI:10.1002/anie.202000224
日期:2020.3.23
Herein, we report a one‐electron strategy for catalytic amide synthesis that enables the direct carbamoylation of (hetero)aryl bromides. This radical cross‐coupling approach, which is based on the combination of nickel and photoredox catalysis, proceeds at ambient temperature and uses readily available dihydropyridines as precursors of carbamoyl radicals. The method's mild reaction conditions make
A new coupling reagent for peptide synthesis. Benzotriazolvyloxy-bis (pyrroltdino) -carbonium hexaflouorophosphate (BBC)
作者:Shaoqing Chen、Jiecheng Xu
DOI:10.1016/s0040-4039(00)92333-5
日期:1992.1
Benzotriazolyloxy-bis(pyrrolidino)-carbonium hexa- fluorophosphate (BBC) is found to be a new excellent couplingreagent devoid of cytotoxic by-product instead of HBTU and BOP. It has been applied in the solution and solid phase peptidesynthesis.
Practical Peptide Synthesis Mediated by a Recyclable Hypervalent Iodine Reagent and Tris(4-methoxyphenyl)phosphine
作者:Chi Zhang、Shan-Shan Liu、Bo Sun、Jun Tian
DOI:10.1021/acs.orglett.5b02045
日期:2015.8.21
1,4-dione (p-BTFP-iodosodilactone, 1a) was synthesized and demonstrated to be an efficient hypervalent iodine(III) reagent for the synthesis of dipeptides from various standard amino acids, including sterically hindered amino acids, in good to high yields within 30 min in the presence of tris(4-methoxyphenyl)phosphine. In addition, the combined system of 1a/(4-MeOC6H4)3P was used to synthesize the
Furan-Based Locked<i>Z</i>-Vinylogous γ-Amino Acid Stabilizing Protein α-Turn in Water-Soluble Cyclic α<sub>3</sub>γ Tetrapeptides
作者:Yarkali Krishna、Shrikant Sharma、Ravi S. Ampapathi、Dipankar Koley
DOI:10.1021/ol5002126
日期:2014.4.18
Described here is the design, synthesis, and conformational analysis of cyclic tetrapeptides (CTPs) with α3γ architecture containing a furan-based locked Z-vinylogous amino acid (Vaa). This unnatural amino acid locks into a γ-turn that induces type IαRS-turn in the CTPs. Stabilized by a 13-membered intramolecular H-bond, these CTPs show robust conformation in water and aprotic solvent irrespective