Divergent base-induced reactivity of cycloalkenyl-1-diazenes
作者:Orazio A. Attanasi、Stefano Berretta、Lucia De Crescentini、Gianfranco Favi、Paolino Filippone、Gianluca Giorgi、Fabio Mantellini
DOI:10.1016/j.tet.2010.06.061
日期:2010.8
The different base-promoted regioselectivities of the ring closure processes in the reactions between cycloalkenyl-1-diazenes and beta-ketoesters are investigated. Under the appropriate conditions it is possible to turn the synthesis towards cycloalkenyliden-pyrroles or functionalized 3-hydroxy-hydrocinnolines. The aromatization procedure of the heteroring counterpart of the 3-hydroxy-hydrocinnolines is also reported. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of Polycyclic Fused Indoline Scaffolds through a Substrate-Guided Reactivity Switch
作者:Cecilia Ciccolini、Giacomo Mari、Francesco G. Gatti、Giuseppe Gatti、Gianluca Giorgi、Fabio Mantellini、Gianfranco Favi
DOI:10.1021/acs.joc.0c01489
日期:2020.9.4
Zn(II)-catalyzed divergent synthesis of functionalized polycyclic indolines through formal [3 + 2] and [4 + 2] cycloadditions of indoles with 1,2-diaza-1,3-dienes (DDs) is reported. The nature and type of substituents of substrates are found to act as a chemical switch to trigger two distinct reaction pathways and to obtain two different types of products upon the influence of the same catalyst. The mechanism of both [4 + 2] and [3 + 2] cycloadditions was investigated and fully rationalized by density functional theory (DFT) calculations.
Construction of Unusual Indole-Based Heterocycles from Tetrahydro-1H-pyridazino[3,4-b]indoles
作者:Cecilia Ciccolini、Lucia De Crescentini、Fabio Mantellini、Giacomo Mari、Stefania Santeusanio、Gianfranco Favi
DOI:10.3390/molecules25184124
日期:——
heterocycles which have a structural connection with biologicallyactive natural-like molecules. The selective oxidation of indoline nucleus to indole, hydrolysis of ester and carbamoyl residues followed by decarboxylation with concomitant aromatization of the pyridazine ring starting from tetrahydro-1H-pyridazino[3,4-b]indole derivatives lead to fused indole-pyridazine compounds. On the other hand, non-fused