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;
Tantalum-Catalyzed Amidation of Amino Acid Homologues
作者:Wataru Muramatsu、Hisashi Yamamoto
DOI:10.1021/jacs.9b08415
日期:2019.12.4
tantalum-catalyzed solvent-free approach for the construction of amide bonds with 1-(trimethylsilyl)imidazole is developed, and the mild reaction conditions are applicable to a wide variety of electrophilic aminoacid homologs. This approach delivers a new class of peptides in high yields without any epimerization.
Peptide Bond Formation of Amino Acids by Transient Masking with Silylating Reagents
作者:Wataru Muramatsu、Hisashi Yamamoto
DOI:10.1021/jacs.1c02600
日期:2021.5.12
A one-pot peptide bond-forming reaction has been developed using unprotected amino acids and peptides. Two different silylating reagents, HSi[OCH(CF3)2]3 and MTBSTFA, are instrumental for the successful implementation of this approach, being used for the activation and transient masking of unprotected amino acids and peptides at C-termini and N-termini, respectively. Furthermore, CsF and imidazole
Waste-free catalytic assembly of α-amino acids is fueled by a multiboron catalyst that features a characteristic B3NO2 heterocycle, providing a versatile catalytic protocol wherein functionalized natural α-amino acid units are accommodated and commonly used protecting groups are tolerated. The facile dehydrative conditions eliminate the use of engineered peptide coupling reagents, exemplifying a greener
α-氨基酸的无废催化组件由具有特征性B 3 NO 2杂环的多硼催化剂提供燃料,从而提供了一种通用的催化方案,其中可以容纳官能化的天然α-氨基酸单元,并且可以耐受常用的保护基团。简便的脱水条件消除了工程化肽偶联剂的使用,为肽偶联提供了更绿色的催化选择。催化作用足够坚固,可以合成五肽,以催化方式构建所有四个酰胺键。
Synthesis of Silacyclic Dipeptides: Peptide Elongation at Both N- and C-Termini of Dipeptide
作者:Tomohiro Hattori、Hisashi Yamamoto
DOI:10.1021/jacs.1c11260
日期:2022.2.2
A new type of peptide bond formation utilizing silacyclic aminoacids or peptides is described. This work has the following advantages: (1) imidazolylsilane is a highly fascinating coupling reagent for dipeptide synthesis from N-,C-terminal unprotected aminoacids with aminoacid tert-butyl esters; (2) deprotection of the tert-butyl ester at the C-terminus and cyclization sequentially proceed depending