Catalyst-free direct C(sp<sup>3</sup>)–H sulfenylation of xanthene derivatives using air as the oxidant
作者:Qian Chen、Guodian Yu、Xiaofeng Wang、Yingcong Ou、Yanping Huo
DOI:10.1039/c8gc03898h
日期:——
A catalyst-free direct C(sp3)–H sulfenylation has been achieved via the autoxidative cross-dehydrogenative coupling (CDC) between xanthene derivatives and thiophenols in ethanol using air as the sole oxidant at room temperature. This simple and efficient method provides straightforward access to 9-sulfenylated xanthenes, 9,10-dihydroacridines and thioxanthene with good functional group compatibility
Direct C–H Bond Imidation with Benzoyl Peroxide as a Mild Oxidant and a Reagent
作者:Tobias Brandhofer、Andrea Gini、Sebastian Stockerl、Dariusz G. Piekarski、Olga García Mancheño
DOI:10.1021/acs.joc.9b01765
日期:2019.10.18
A simple and mild Cu-catalyzed oxidative three-component oxidative Ugi-type method for the synthesis of a variety of substituted imides has been developed. In this direct imidation approach, benzoyl peroxide serves as both the oxidant and the carboxylate source, allowing not only the functionalization of C(sp3)-H bonds in α-position to an amine but also benzylic substrates. This procedure presents
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
Copper-catalyzed aerobic asymmetric cross-dehydrogenative coupling of C(sp<sup>3</sup>)–H bonds driven by visible light
作者:Kexu Zhou、Ying Yu、Yu-Mei Lin、Yanjun Li、Lei Gong
DOI:10.1039/d0gc00262c
日期:——
Asymmetric cross-dehydrogenative coupling (CDC) of C(sp3)–H bonds shows great potential for rapid and stereoselective construction of C–Cbonds and use of molecular oxygen as the oxidant for such transformations is appealing in the context of green synthetic methodologies. However, the poor reactivity of oxygen at the ground state and the challenges in controlling the stereochemistry make it extremely