Rational Design of an Organocatalyst for Peptide Bond Formation
作者:Handoko、Sakilam Satishkumar、Nihar R. Panigrahi、Paramjit S. Arora
DOI:10.1021/jacs.9b07742
日期:2019.10.9
important impact by reducing the significant waste generated during peptidesynthesis. We describe the rational design of a biomimetic catalyst that can efficiently couple amino acids featuring standard protecting groups. The catalyst design combines lessons learned from enzymes, peptide biosynthesis, and organocatalysts. Under optimized conditions, 5 mol% catalyst efficiently couples Fmoc amino acids
A Lewis-acid-catalyzed method for the substrate-directed formation of peptide bonds has been developed, and this powerful approach is utilized for the new "remote" activation of carboxyl groups under solvent-free conditions. The presented method has the following advantages: 1) the high-yielding peptidesynthesis uses a tantalum catalyst for any amino acids; 2) the reaction proceeds without any racemization;
Synthesis and Characterization of Barnacle Adhesive Mimetic towards Underwater Adhesion
作者:Jin Nishida、Yuji Higaki、Atsushi Takahara
DOI:10.1246/cl.150311
日期:2015.8.5
A polyacrylamide including tetra-alanine units, hydroxy groups, and hexyl groups was synthesized as a mimetic of barnacle underwater adhesive proteins. The synthesized barnacle mimetic polymer was dissolved in water and subjected to a condensation reaction with hexylamine. Gelation through multiple hydrogen bonds of the oligo-alanine units was confirmed. The adhesive strength of the bonded substrate with the gel-forming barnacle mimetic polymer solution was demonstrated to be 402 kPa for poly(methyl methacrylate) (PMMA) plate adhesion by the tensile shear adhesion test.
Organocatalytic Activation of Inert Hydrosilane for Peptide Bond Formation
作者:Wataru Muramatsu、Hisashi Yamamoto
DOI:10.1021/acs.orglett.2c02947
日期:2022.10.7
describe the development of a reliable catalytic protocol for peptidebondformation that is generally applicable to natural and unnatural α-amino acids, β-amino acids, and peptides bearing various functional groups. A 10 mol % loading of HSi[OCH(CF3)2]3 as a catalyst was sufficient to guarantee a consistently high yield of the resulting peptide. This method facilitates the sustainable utilization of natural
straightforward peptidebondformation of N-, and C-terminal unprotected amino acids was successfully achieved by using trimethylaluminum. The coupling reaction was accomplished by pre-reaction of N-, and C-terminal unprotected amino acids and trimethylaluminum to form a five-membered ring that smoothly reacted with nucleophilic amino acid esters. This simple and highly efficient reaction system allows
通过使用三甲基铝,成功地实现了 N 端和 C 端未保护氨基酸的高效、直接的肽键形成。偶联反应是通过N端和C端未保护的氨基酸与三甲基铝预反应形成五元环,与亲核氨基酸酯顺利反应来完成的。这种简单高效的反应系统允许一锅法合成三肽,而不需要昂贵的偶联试剂。此外,即使对于侧链上具有大量取代基的氨基酸,也可以有效地形成肽键,以一锅法高产率地提供相应的三肽。此外,该反应可通过随后添加氨基酸和三甲基铝来进一步延伸肽。我们预计这种经济高效、简单且高效的方案将有助于合成多种肽。