Efficient Reagents for the Synthesis of 5-, 7-, and 5,7-Substituted Indoles Starting from Aromatic Amines: Scope and Limitations
摘要:
Upon reaction with IPy(2)BF(4), 4-substituted anilines give regioselectively the corresponding o-iodoanilines in nearly quantitative yield, in a process that can be carried out on a multigram scale. Palladium-catalyzed coupling of the resulting 2-iodoanilines with (trimethylsilyl)acetylene (TMSA), followed by efficient CuI-mediated nitrogen cyclization onto alkynes with concurrent elimination of the TMS substituent, allows a straightforward elaboration of 5-mono- and 5,7-disubstituted indoles from aromatic amines. This new approach to the aforementioned indoles does not requires protective groups on nitrogen at any step and can be adapted for preparing related 7-manosubstituted indoles. Moreover, examples iterating the process are given, allowing bis-annulation and sequential double annulation and resulting in synthesis of benzodipyrroles. Additionally, suitable conditions for iodination of some of the target indoles with IPy(2)BF(4) are discussed.
[EN] MACROCYCLIC BROAD SPECTRUM ANTIBIOTICS<br/>[FR] ANTIBIOTIQUES MACROCYCLIQUES À LARGE SPECTRE
申请人:RQX PHARMACEUTICALS INC
公开号:WO2018149419A1
公开(公告)日:2018-08-23
Provided herein are antibacterial compounds, wherein the compounds in some embodiments have broad spectrum bioactivity. In various embodiments, the compounds act by inhibition of bacterial type 1 signal peptidase (SpsB), an essential protein in bacteria. Pharmaceutical compositions and methods for treatment using the compounds described herein are also provided.
[EN] NEW ARYL-QUINOLINE DERIVATIVES<br/>[FR] NOUVEAUX DÉRIVÉS D'ARYLQUINOLÉINE
申请人:HOFFMANN LA ROCHE
公开号:WO2013064465A1
公开(公告)日:2013-05-10
The invention provides novel compounds having the general formula (I), wherein R1, R2, R3, R4 R5, R6 and n are as described herein, compositions including the compounds and methods of using the compounds.
<i>p</i>-Toluenesulfonic Acid Promoted Annulation of 2-Alkynylanilines with Activated Ketones: Efficient Synthesis of 4-Alkyl-2,3-Disubstituted Quinolines
Reactions between readily available 2-alkynylanilines and activatedketones such as β-keto esters promoted by p-toluenesulfonicacid afford 4-alkyl-2,3-disubstitutedquinolines in good to excellent yields. The generality of substituents at the other end of the triple bond of 2-alkynylanilines makes the method a valuable approach to diversified 4-alkylquin-olines, which are difficult to obtain by classical
A dramatic enhancing effect of InBr3 was observed towards the oxidative Sonogashira cross-coupling reaction of 2-ethynylaniline with (E)-trimethyl(3,3,3-trifluoroprop-1-enyl)silane.
Photopromoted Entry to Benzothiophenes, Benzoselenophenes, 3<i>H</i>-Indoles, Isocoumarins, Benzosultams, and (Thio)flavones by Gold-Catalyzed Arylative Heterocyclization of Alkynes
作者:Benito Alcaide、Pedro Almendros、Eduardo Busto、Fernando Herrera、Carlos Lázaro-Milla、Amparo Luna
DOI:10.1002/adsc.201700427
日期:2017.8.7
gold‐photoredox‐catalyzed reactions of heteroatom (N, S, Se, O) tethered alkynes with arenediazonium salts selectively proceeded to build vicinal diaryl‐substituted 2H‐benzo[e][1,2]thiazine 1,1‐dioxides (benzosultams), benzoselenophenes, benzothiophenes, 4H‐chromen‐4‐ones (flavones), 3H‐indoles, 1H‐isochromen‐1‐ones (isocoumarins), and 4H‐thiochromen‐4‐ones (thioflavones). Moreover, the utility of functionalized