FeCl
<sub>3</sub>
‐Catalyzed Formal [3+2] Cyclodimerization of 4‐Carbonyl‐1,2‐diaza‐1,3‐dienes
作者:Giacomo Mari、Matteo Corrieri、Lucia De Crescentini、Gianfranco Favi、Stefania Santeusanio、Fabio Mantellini
DOI:10.1002/ejoc.202101046
日期:2021.10.7
An 1,2-diaza-1,3-diene's cyclodimerization that provides symmetrical fully substituted 1-amino pyrroles through an unusual formal [3+2] reaction is investigated. The study has demonstrated that the presence of electron withdrawing groups on the terminal carbon atom of the azo-ene system is crucial for the success of the reaction. The synthesis occurs with complete regioselectivity and requires a very
Metal and Oxidant Free Construction of Substituted‐ and/or Polycyclic Indoles: A Useful Alternative to Bischler and Related Syntheses
作者:Giacomo Mari、Lucia De Crescentini、Gianfranco Favi、Stefania Santeusanio、Fabio Mantellini
DOI:10.1002/ejoc.202000845
日期:2020.9.7
wide range of substitutedindoles, including complex polycyclic‐architectures were easily assembled by means of a Amberlyst 15H catalyzed synthesis that employs 1,2‐diaza‐1,3‐dienes and anilines. The metal and oxidant free methodology proposed here is characterized by good yields, total and predictable regioselectivity, and the ability to provide electron withdrawing substitutedindoles.
Indoline‐fused polycycles were synthesized through a TFA‐promoted intramolecular dearomative cyclization of indole‐tethered pyrroles. Mechanistically, the strategic carbon‐carbon bond formation is hypothesized to proceed via a Pictet‐Spengler‐type reaction wherein a reversal of conventional indole reactivity of tryptamine derivatives occurs. The synthetic versatility of this operationally simple, atom‐economic
通过TFA促进的吲哚系吡咯的分子内脱芳香环化反应合成了吲哚啉稠合的多环化合物。从机理上讲,战略性碳-碳键的形成被假定为通过Pictet-Spengler型反应进行,其中发生了常规的色胺胺衍生物的吲哚反应性逆转。这种操作简单的,原子经济的方法具有多种通用性,可通过制备天然产物高法丝溶素C的吡啶并[1,2- a:3,4- b' ]二吲哚核心来证明。
Palladium(II)-Catalyzed Intramolecular Oxidative C–H/C–H Cross-Coupling Reaction of C3,N-Linked Biheterocycles: Rapid Access to Polycyclic Nitrogen Heterocycles
A Pd(II)-catalyzed intramolecular oxidative C–H/C–H cross-coupling has been developed for the direct construction of valuable polycyclic heteroarene scaffolds. From a retrosynthetic point of view, the strategic formation of a C–C bond via C(sp2)–H/C(sp2)–H dehydrogenative coupling across C3,N-linked biheterocyclic precursors may be useful in de novo syntheses of indole-derived natural products and
A facile protocol for the preparation of 2-carboxylated thieno [2,3-<i>b</i>] indoles: a <i>de novo</i> access to alkaloid thienodolin
作者:Giacomo Mari、Lucia De Crescentini、Gianfranco Favi、Stefania Santeusanio、Fabio Mantellini
DOI:10.1039/d2ob00440b
日期:——
3-dienes and indoline 2-thione and requires mild reaction conditions. Furthermore, the easy work-up required makes this method amenable for a one-pot approach as demonstrated in the preparation of thienodolin, a natural product isolated from Streptomyces albogriseolus that exhibits valuable biological properties.
已成功开发出一种无金属策略,可替代已知的复杂环加成反应,生成 2-羧化噻吩并 [2,3- b ] 吲哚衍生物。新方法涉及作为起始材料易于获得的 1,2-二氮杂-1,3-二烯和二氢吲哚 2-硫酮,并且需要温和的反应条件。此外,所需的简单后处理使该方法适用于一锅法,如噻吩多林的制备所证明的那样,噻吩多林是一种从白灰链霉菌中分离出来的天然产物,具有有价值的生物学特性。