提出了一种涉及 ugiase 和异氰化物氧化酶的独特作用的 halichonadin G 生物合成途径。这一假设在合成这种海绵萜的核心结构单元的仿生方法中得到了检验,该方法依赖于关键的 Ugi 偶联反应和异氰化物到异氰酸酯的氧化转化。这项工作的结果表明,可以采用仿生策略以有效的方式构建 halichonadin G 的核心结构。
提出了一种涉及 ugiase 和异氰化物氧化酶的独特作用的 halichonadin G 生物合成途径。这一假设在合成这种海绵萜的核心结构单元的仿生方法中得到了检验,该方法依赖于关键的 Ugi 偶联反应和异氰化物到异氰酸酯的氧化转化。这项工作的结果表明,可以采用仿生策略以有效的方式构建 halichonadin G 的核心结构。
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
reaction sequence furnished an α-hydroxy malonamide connected with two identical terpene units which is the identical structural motif found in halichonadin H. A pathway is proposed for the biosynthesis of the unique homodimeric terpene, halichonadin H. The proposed biosynthetic pathway involves two key Passerini reactions of eudesmane-type terpene isocyanides. The Passerini reaction of a model terpene
Biomimetic Approaches Employing the Ugi Five-Center Four-Component Reaction for Synthesis of the Right-Hand Portion of Halichonadin Q and the Central Part of Halichonadin M
using the Ugi five-center four-componentreaction (U-5C-4CR), were executed. The biomimetic strategy employed in these routes demonstrates the feasibility of pathways we have proposed for the biosynthesis of marine organisms. One-pot syntheses of models of the right-hand portion and the central part of the respective structures of halichonadins Q and M, using the Ugi five-center four-component reaction
A unique pathway for the biosynthesis of the marine sponge terpenes, exigurin and boneratamides A-C, is proposed. Based on this proposal, a biomimetic strategy on key Ugi coupling reactions between terpene isocyanides and amino acids was developed for construction of the core structures of exigurin and boneratamides A-C.
A Biomimetic Approach to Terpenes Isolated from Marine Sponges: a Ugi Coupling Reaction in a Hypothetical Biosynthesis
A unique pathway for the biosynthesis of marine sponge terpenes is proposed. Based on this proposal, a biomimetic approach using a Ugi coupling reaction has been designed and applied to the efficient construction of the right-side, peptide-like portions of boneratamides and exigurin.