Synthesis of PNA Monomers andDimers by Ugi Four-Component Reaction
作者:Ping Xu、Ting Zhang、Wenhao Wang、Xiaomin Zou、Xin Zhang、Yiqiu Fu
DOI:10.1055/s-2003-39391
日期:——
method to obtain PNA monomers and PNA chain prolongation by Ugifour-componentcondensationreaction was tested by synthesizing PNA monomers and dimers. This method differs from classical peptide chemistry in that no prior preparation of PNA monomers is needed as they are built up along with the extension of chain. The synthesis of the key component isocyanide is also presented.
肽核酸(PNA)作为分子生物学和生物技术的工具、诊断试剂和潜在的反义药物受到了极大的关注。设计和制备了许多 PNA 衍生物和类似物以改善其物理化学和生物学特性。在大多数情况下,PNA 寡聚体是由 N 保护的单体通过肽合成来合成的。在这项工作中,通过合成 PNA 单体和二聚体,测试了一种通过 Ugi 四组分缩合反应获得 PNA 单体和 PNA 链延长的新方法。这种方法与经典肽化学的不同之处在于不需要预先制备 PNA 单体,因为它们是随着链的延伸而建立的。还介绍了关键组分异氰化物的合成。
Photocaging of Carboxylic Acids: A Modular Approach
作者:Wiktor Szymański、Willem A. Velema、Ben L. Feringa
DOI:10.1002/anie.201402665
日期:2014.8.11
Photocaged compounds are important tools for studying and regulating multiple processes, including biological functions. Reported herein is the use of the Passerini multicomponent reaction for modular preparation of photocagedcarboxylicacids. The reaction is compatible with several functionalities and proceeds smoothly both in water and dichloromethane. The choice of aldehyde determines the wavelength
Stabilization of Cyclic β-Hairpins by Ugi-Reaction-Derived <i>N</i>-Alkylated Peptides: The Quest for Functionalized β-Turns
作者:Manuel G. Ricardo、Aldrin V. Vasco、Daniel G. Rivera、Ludger A. Wessjohann
DOI:10.1021/acs.orglett.9b02592
日期:2019.9.20
aligning antiparallel β-sheets in a macrocyclic scaffold, thus serving as β-hairpin templates. Gramicidin S was used as the model β-hairpin to compare the Ugi-derived β-turns with the type-II′ β-turn. The results show that the multicomponent incorporation of such N-alkylated residues allows for the simultaneous stabilization and exo-cyclic functionalization of cyclic β-hairpins.
Synthesis of Isonitriles from N-Substituted Formamides Using Triphenylphosphine and Iodine
作者:Qun-Li Luo、Xia Wang、Qing-Gang Wang
DOI:10.1055/s-0034-1379111
日期:——
alkyl and aryl isocyanides. Treatment of N-substituted formamides with the reagent combination of triphenylphosphine and molecular iodine, in the presence of a tertiary amine, quickly produces the corresponding isocyanides in high yields under ambient conditions. The process employs readily available and low-cost reagents, a convenient synthetic procedure, and mild reaction conditions for the synthesis