当前用于构建酰胺键的方法通过脱水偶联过程将胺和羧酸连接起来,该过程通常需要有机溶剂、昂贵且通常危险的偶联试剂,并掩盖其他官能团。在这里,我们描述了使用伯胺和酰基三氟硼酸钾的酰胺形成,由在水中快速进行的简单氯化剂促进。该反应在酸性 pH 值下很快,并且可以耐受底物中的醇、羧酸,甚至仲胺。它适用于伯酰胺、磺酰胺和其他通常抵抗经典酰化的 N 官能团的官能化,并可应用于后期官能化。
Synthesis of Chemically and Configurationally Stable Monofluoro Acylboronates: Effect of Ligand Structure on their Formation, Properties, and Reactivities
作者:Hidetoshi Noda、Jeffrey W. Bode
DOI:10.1021/jacs.5b00822
日期:2015.3.25
tetravalent, configurationally stable B-chiral acylboronates. Significantly, the ligands on the boronate allow for fine-tuning of the properties and reactivity of acylboronates. In amide-formingligation with hydroxylamines under aqueous conditions, a considerable difference in reactivity was observed as a function of ligand structure. The solid-state structures suggested that subtle steric and conformational
Concise Synthesis of Potassium Acyltrifluoroborates from Aldehydes through Copper(I)‐Catalyzed Borylation/Oxidation
作者:Jumpei Taguchi、Takumi Takeuchi、Rina Takahashi、Fabio Masero、Hajime Ito
DOI:10.1002/anie.201901748
日期:2019.5.27
subsequent oxidation. This synthetic route is characterized by the wide range of aldehydes accessible, favorable step economy, mild reaction conditions, and tolerance of various functionalgroups, and it enables the facile generation of a range of KATs, for example, bearing halide, sulfide, acetal, or ester moieties. Moreover, this method was applied to the three‐step synthesis of various α‐aminoacid analogues
[EN] LASSO STRUCTURES AND THEIR SYNTHESIS<br/>[FR] STRUCTURES DE TYPE LASSO ET LEUR SYNTHÈSE
申请人:CHROMACON AG
公开号:WO2018091339A1
公开(公告)日:2018-05-24
Method for the synthesis of a molecular lasso structure consisting of a cyclic moiety and of a linear moiety, wherein the linear moiety is covalently attached to the cyclic moiety and with its free end is partially threaded through the orifice formed by the cyclic moiety, including the following steps, preferably in given order: ) provision of a cyclic moiety and of a first linear structural element and establishing conditions in which at least a fraction of the first linear structural element is threaded through the orifice of the cyclic moiety; 2) covalently attaching a stopper element preventing de-threading of the first linear structural element to one terminal end of the first linear structural element; 3) separating unthreaded cyclic moieties and first linear structural elements from threaded molecular assemblies, in which threaded molecular assemblies the first linear structural element with said stopper element is threaded through the cyclic moiety, by chemical and/or physical separation and using essentially only the threaded molecular assemblies for further reaction; 4) reacting the threaded molecular assemblies with a bifunctional second linear structural element so that the second linear structural element is covalently attached to the first linear structural element at or close to its end opposite to the end where the stopper is attached, and so that the second linear structural element is covalently attached to the cyclic moiety.
least one of the templating groups in the product. In this report, we describe a traceless, templated amide-formingligation that proceeds at low micromolar concentration under aqueous conditions in the presence of biomolecules. We utilized the unique features of an acylboronate-hydroxylamine ligation, in which covalent bonds are broken in each of the reactants as the new amide bond is formed. By using
diverse benzyl protected trifluoroborate‐ammoniums were prepared in good to high yields by an efficient hydrogenation of corresponding trifluoroborate‐iminiums using Crabtree's catalyst. Subsequent N‐ and B‐deprotections were demonstrated on selected examples to provide several α‐aminoboronic acids. Preliminary experiments on asymmetric version of the reaction indicated a correlation between E/Z‐ratio