Novel Oxidative Ugi Reaction for the Synthesis of Highly Active, Visible-Light, Imide-Acridinium Organophotocatalysts
作者:Andrea Gini、Mustafa Uygur、Thomas Rigotti、José Alemán、Olga García Mancheño
DOI:10.1002/chem.201802830
日期:2018.8.27
A newly designed class of acridinium‐based organophotocatalysts bearing an imide group at the C9‐position is presented. To achieve these unprecedented structures, a synthetic strategy based on a novel straightforward oxidative Ugi‐type reaction at the benzylic position of C9‐unsubstituted acridanes was developed. The introduction of the imide‐unit affords a notable photocatalytic activity enhancement
Lewis Acid Catalyzed Reductive Cyclization of 2‐Aryloxybenzaldehydes and 2‐(Arylthio)benzaldehydes to Unsubstituted 9
<i>H</i>
‐Xanthenes and Thioxanthenes in Diisopropyl Ether
作者:Shashi Kant Verma、Anamika Prajapati、Manoj Kumar Saini、Ashok K. Basak
DOI:10.1002/adsc.202000836
日期:2021.1.19
Readily accessible 2‐aryloxybenzaldehydes and 2‐(arylthio)benzaldehydes undergo a sequence of reactions leading to a wide variety of unsubstituted 9H‐xanthenes and thioxanthenes in high yields when heated with a Lewisacid in diisopropyl ether. This reductive cyclization method is compatible with several important functional groups. The method is also applicable for the selective reductive cyclization
Mild Radical Oxidative sp3-Carbon–Hydrogen Functionalization: Innovative Construction of Isoxazoline and Dibenz[b,f]oxepine/azepine Derivatives
作者:Olga Mancheño、Andrea Gini
DOI:10.1055/s-0035-1560908
日期:——
hydroxylamines and for the synthesis of dibenz[b,f]oxepines, dibenzo[b,f]thiepines, and dibenz[b,f]azepines from simple xanthenes, thioxanthenes, and acridanes, respectively. 1 Introduction 2 2,2,6,6-Tetramethylpiperidinyloxyl-Mediated Dehydrogenative Formation and Trapping of Unstable Nitrones: Synthesis of N-Alkoxycarbonyl-Protected Isoxazoline Derivatives 3 Oxidative sp3-Carbon–Hydrogen Bond Functionalization
Oxidative CH Bond Functionalization and Ring Expansion with TMSCHN<sub>2</sub>: A Copper(I)-Catalyzed Approach to Dibenzoxepines and Dibenzoazepines
作者:Tobias Stopka、Leyre Marzo、Mercedes Zurro、Simon Janich、Ernst-Ulrich Würthwein、Constantin G. Daniliuc、José Alemán、Olga García Mancheño
DOI:10.1002/anie.201411726
日期:2015.4.20
research. However, their syntheses are generally rather tedious, requiring several steps that involve a Wagner–Meerwein‐type rearrangement under harsh conditions. Herein, we present the first copper(I)‐catalyzedoxidative CH bond functionalization and ring expansion with TMSCHN2 to yield these important derivatives in a facile and straightforward way.