A novel palladium-catalyzed interannular selective C-H silylation of 1,1'-biaryl-2-acetamides is described. The combination of palladium catalyst with copper oxidant enables meta- or ortho-selective C-H silylation by employing hexamethyldisilane as a trimethylsilyl source, which relies on the control of NBE derivatives as a switch, thus providing straightforward access to divergent silicon-containing 1,1'-biaryl-2-acetamides.
[EN] NEW CLASS OF DNA GYRASE AND/OR TOPOISOMERASE IV INHIBITORS WITH ACTIVITY AGAINST GRAM-POSITIVE AND GRAM-NEGATIVE BACTERIA [FR] NOUVELLE CLASSE D'INHIBITEURS D'ADN GYRASE ET/OU DE TOPOISOMÉRASE IV AYANT UNE ACTIVITÉ CONTRE DES BACTÉRIES À GRAM POSITIF ET À GRAM NÉGATIF
CuI/Oxalic Diamide Catalyzed Coupling Reaction of (Hetero)Aryl Chlorides and Amines
作者:Wei Zhou、Mengyang Fan、Junli Yin、Yongwen Jiang、Dawei Ma
DOI:10.1021/jacs.5b08411
日期:2015.9.23
A class of oxalic diamides are found to be effective ligands for promoting CuI-catalyzed aryl amination with less reactive (hetero)aryl chlorides. The reaction proceeds at 120 °C with K3PO4 as the base in DMSO to afford a wide range of (hetero)aryl amines in good to excellent yields. The bis(N-aryl) substituted oxalamides are superior ligands to N-aryl-N'-alkyl substituted or bis(N-alkyl) substituted
发现一类草酸二酰胺是促进 CuI 催化的芳基胺化与反应性较低的(杂)芳基氯化物的有效配体。该反应在 120 °C 下以 K3PO4 作为碱在 DMSO 中进行,以良好到极好的收率提供范围广泛的(杂)芳基胺。双(N-芳基)取代的草酰胺是优于N-芳基-N'-烷基取代或双(N-烷基)取代的草酰胺的配体。配体中芳环的电子性质和空间性质对其效率都很重要。
A ruthenium-catalyzed free amine directed (5+1) annulation of anilines with olefins: diverse synthesis of phenanthridine derivatives
annulation between 2-aminobiphenyls and activated olefins is disclosed for succinct synthesis of valuable phenanthridine scaffolds. The protocol avails a common organic functional group, free amine, as a directing group and represents a unique combination of C–Hactivation/annulation/C–C bond cleavage cascade that bodes well in the production of bioactive alkaloids including trisphaeridine and bicolorine
xanthate-based radicaladdition/cyclization reaction cascade toward 2-biphenylisocyanides is described as a practical and modular approach to 6-alkylated phenanthridines. The use of xanthates as radical precursors allowed the synthesis of diversely 6-substituted phenanthridines. Electrophilicradicals derived from nitriles, aromatic and aliphatic ketones, malonates, and amide derivatives, as well as radicals
Intramolecular Oxidative C−N Bond Formation for the Synthesis of Carbazoles: Comparison of Reactivity between the Copper-Catalyzed and Metal-Free Conditions
作者:Seung Hwan Cho、Jungho Yoon、Sukbok Chang
DOI:10.1021/ja111652v
日期:2011.4.20
New synthetic procedures for intramolecular oxidative C-N bondformation have been developed for the preparation of carbazoles starting from N-substituted amidobiphenyls under either Cu-catalyzed or metal-freeconditions using hypervalent iodine(III) as an oxidant. Whereas iodobenzene diacetate or bis(trifluoroacetoxy)iodobenzene alone undergoes the reaction to provide carbazole products in moderate
已经开发了用于分子内氧化 CN 键形成的新合成程序,用于在 Cu 催化或无金属条件下使用高价碘 (III) 作为氧化剂从 N 取代的酰氨基联苯制备咔唑。虽然二乙酸碘苯或双(三氟乙酰氧基)碘苯单独进行反应以提供中低收率的咔唑产物,但三氟甲磺酸铜(II)和碘(III)物质的组合使用显着提高了反应效率,提供了更多样化的范围产品良率高。在包括动力学曲线、同位素效应和自由基抑制实验在内的机理研究的基础上,铜物种被提议用于催化激活高价碘 (III) 氧化剂。
Synthesis of phenanthridinones viapalladium-catalyzed C(sp<sup>2</sup>)–H aminocarbonylation of unprotected o-arylanilines
An efficient synthesis of free (NH)-phenanthridinones through Pd-catalyzed C(sp(2))-H aminocarbonylation of unprotected o-arylanilines under an atmospheric pressure of CO has been developed. Some ortho heteroarene substituted anilines as well as N-alkyl protected o-arylanilines are also suitable substrates for this C-H aminocarbonylation reaction.