On the scope of the double Ugi multicomponent stapling to produce helical peptides
作者:Manuel G. Ricardo、Yadiel Vázquéz-Mena、Yuleidys Iglesias-Morales、Ludger A. Wessjohann、Daniel G. Rivera
DOI:10.1016/j.bioorg.2021.104987
日期:2021.8
multicomponent stapling approach in its capacity to produce helicalpeptides from unstructured sequences. For this, three different stapling combinations were implemented and the CD spectra of the cyclic peptides were measured to determine the effect of the multicomponent macrocyclization on the resulting secondary structure. A new insight into some structural factors influencing the helicity type and content
通过肽钉合方法稳定螺旋结构现在是一种成熟的技术,能够提供各种生物医学应用。最近,表明多组分大环化不仅是引入构象约束的有效方法,而且还允许在一锅法中将额外的功能结合到主食部分。这项工作调查了双 Ugi 多组分装订方法在从非结构化序列中产生螺旋肽的能力方面的范围。为此,实施了三种不同的装订组合,并测量了环肽的 CD 光谱,以确定多组分大环化对所得二级结构的影响。
Synthesis of 1-substituted tetrazoles via the acid-catalyzed [3+2] cycloaddition between isocyanides and trimethylsilyl azide
作者:Tienan Jin、Shin Kamijo、Yoshinori Yamamoto
DOI:10.1016/j.tetlet.2004.10.103
日期:2004.12
were synthesized via the [3+2] cycloaddition between isocyanides and trimethylsilyl azide in the presence of an acid catalyst and MeOH. Various 1-substituted tetrazoles were obtained in good to high yields. The reaction probably proceeds through the in situ formation of hydrazoic acid, followed by a successive [3+2] cycloaddition with the isocyanide activated by an acid.
申请人:KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION
公开号:US20170233417A1
公开(公告)日:2017-08-17
A hydrosilylation reaction catalyst prepared from: a catalyst precursor comprising a transition metal compound, excluding platinum, belonging to group 8-10 of the periodic table, e.g., iron acetate, cobalt acetate, nickel acetate, etc.; and a ligand comprising an isocyanide compound such as t-butyl isocyanide. The hydrosilylation reaction catalyst has excellent handling and storage properties. As a result of using this catalyst, a hydrosilylation reaction can be promoted under gentle conditions.
Amphoteric 2-(sulfonylamino)benzaldehydes, secondary amines and isocyanides in the multicomponent synthesis of elusive N -alkyl-2,3-diaminoindoles
作者:Mariateresa Giustiniano、Sveva Pelliccia、Luca Sangaletti、Fiorella Meneghetti、Jussara Amato、Ettore Novellino、Gian Cesare Tron
DOI:10.1016/j.tetlet.2017.09.076
日期:2017.11
A novel interrupted Ugi reaction between ortho-sulfonylaminated aryl aldehydes, secondary amines, and isocyanides affords in good to high yields N-alkyl-2,3-diaminoindoles, providing access to a so far unexplored area of the indole chemical space. With only one single chemical operation, this novel reaction affords a broad gamma of substituted 2,3-diaminoindoles with five points of diversity. The success
A Successful Replacement of Phenols with Isocyanides in the Bargellini Reaction: Synthesis of 3-Carboxamido-Isobutyric Acids
作者:Mariateresa Giustiniano、Sveva Pelliccia、Ubaldina Galli、Jussara Amato、Fabio Travagin、Ettore Novellino、Gian Cesare Tron
DOI:10.1021/acs.joc.6b02130
日期:2016.11.18
Old multicomponent reactions are still a source of inspiration for discovering novel combinations of three or more reactants. A simple idea is to replace one of the educts of a known multicomponent reaction with another functional group and still be able to mimic the same reactivity. Following this line of thought, we report a three-component reaction in which isocyanides are able to open the epoxide