Synthesis of Azacarbolines via PhIO<sub>2</sub>-Promoted Intramolecular Oxidative Cyclization of α-Indolylhydrazones
作者:Matteo Corrieri、Lucia De Crescentini、Fabio Mantellini、Giacomo Mari、Stefania Santeusanio、Gianfranco Favi
DOI:10.1021/acs.joc.1c02217
日期:2021.12.17
An unprecedented synthesis of polysubstituted indole-fused pyridazines (azacarbolines) from α-indolylhydrazones under oxidative conditions using a combination of iodylbenzene (PhIO2) and trifluoroacetic acid (TFA) has been developed. This transformation is conducted without the need for transition metals, harsh conditions, or an inert atmosphere.
A Novel Assembly of Substituted Pyrroles by Acid-Catalyzed Sequential Three-Component Reaction of Amines, Alkynoates, and 1,2-Diaza-1,3-dienes
作者:Orazio A. Attanasi、Gianfranco Favi、Fabio Mantellini、Giada Moscatelli、Stefania Santeusanio
DOI:10.1002/adsc.201100094
日期:2011.6
A novel protocol for the assembly of polysubstituted pyrroles has been developed through the acid‐catalyzed, sequential three‐component reaction of primary aliphatic amines, alkynoates and 1,2‐diaza‐1,3‐dienes (DDs). This methodology proceeds with complete chemo‐/regioselectivity involving first formation of an enamino ester intermediate, in situ Michael addition with azo‐ene compounds and subsequent
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。
Study of the nucleophilic behaviour of N-phenylbenzamidine towards 1,2-diaza-1,3-dienes: domino reactions for imidazole scaffolds
作者:Orazio A. Attanasi、Silvia Bartoccini、Gianluca Giorgi、Fabio Mantellini、Francesca R. Perrulli、Stefania Santeusanio
DOI:10.1016/j.tet.2010.04.108
日期:2010.7
Depending on the nature of the solvent, alcohol or DMF, N-phenylbenzamidine shows different nucleophilic behaviour towards the conjugated azo–ene system of 1,2-diaza-1,3-dienes. In alcohol it reacts as a nucleophile through the N-phenyl imino nitrogen affording spiro pyrroloimidazoles and 1,3-diphenyl-1H-imidazoles. In DMF, by contrast, it behaves as nucleophile mainly by means of the imino amidino
Enantiodivergent Cyclization of Racemic Cyclohexadienones via Parallel Kinetic Asymmetric Transformation
作者:Xiang Gao、Bei-Bei Li、Yu-Wei Li、Xiao Xiao、Meng-Meng Liu、Guang-Jian Mei
DOI:10.1021/acs.orglett.4c02396
日期:2024.7.26
convert available racemic substrates into valuable enantioenriched products are urgently needed in organicsynthesis. Reported herein is the first parallel kinetic asymmetric transformation of racemic cyclohexadienones. Racemic cyclohexadienones are first diastereoselectively converted into a new pair of racemic transient dienol intermediates, which are then parallel protonated by chiral phosphoric acid