Silver(I)- or Copper(II)-Mediated Dearomatization of Aromatic Ynones: Direct Access to Spirocyclic Scaffolds
作者:Michael J. James、James D. Cuthbertson、Peter O'Brien、Richard J. K. Taylor、William P. Unsworth
DOI:10.1002/anie.201501812
日期:2015.6.22
A high‐yielding silver(I)‐ or copper(II)‐catalyzed dearomatizing spirocyclization strategy allows the conversion of simple aromatic compounds that contain ynone substituents, including indole, anisole, pyrrole, and benzofuran derivatives, into functionalized spirocyclic scaffolds. A high‐yielding asymmetric variant furnishes spirocyclic indolenines in up to 89:11 e.r.
Cation Triggered Domino Aza-Piancatelli Rearrangement/Friedel–Crafts Alkylation of Indole-Tethered Furfuyl Alcohols to Access Cycloocta[<i>b</i>]indole Core of Alkaloids
作者:Nagarjuna Reddy Vonteddu、Pooja R. Solanke、Kiranmai Nayani、Srivari Chandrasekhar
DOI:10.1021/acs.orglett.0c03155
日期:2020.11.6
A domino approach to bridged cycloocta[b]indolone through a cascade of aza-Piancatelli rearrangement/Friedel–Crafts alkylation is developed. This transformation has been realized by reaction of an indole-tethered 2-furylcarbinol and substituted aniline in the presence of a Lewis acid to initiate aza-Piancatelli rearrangement followed by an in situ intramolecular Friedel–Crafts alkylation to access bridged
开发了一种通过aza-Piancatelli重排/ Friedel-Crafts烷基化级联反应桥接多环[ b ]吲哚酮的多米诺方法。这种转化是通过在路易斯酸存在下使吲哚链连接的2-呋喃基甲醇与取代的苯胺反应以引发aza-Piancatelli重排,然后进行原位分子内Friedel-Crafts烷基化反应以在一个罐中获得桥联的四环骨架而实现的。
Fluorination Patterning: A Study of Structural Motifs That Impact Physicochemical Properties of Relevance to Drug Discovery
作者:Quentin A. Huchet、Bernd Kuhn、Björn Wagner、Nicole A. Kratochwil、Holger Fischer、Manfred Kansy、Daniel Zimmerli、Erick M. Carreira、Klaus Müller
DOI:10.1021/acs.jmedchem.5b01455
日期:2015.11.25
The synthesis of a collection of 3-substituted indole derivatives incorporating partially fluorinated n-propyl and n-butyl groups is described along with an in-depth study of the effects of various fluorination patterns on their properties, such as lipophilicity, aqueous solubility, and metabolic stability. The experimental observations confirm predictions of a marked lipophilicity decrease imparted
Selective Synthesis of Six Products from a Single Indolyl α-Diazocarbonyl Precursor
作者:Michael J. James、Peter O'Brien、Richard J. K. Taylor、William P. Unsworth
DOI:10.1002/anie.201605337
日期:2016.8.8
α‐diazocarbonyls can be selectively cyclized to give six distinct products through the careful choice of catalyst and reaction conditions. A range of catalysts were used, including complexes of RhII, PdII, and CuII, as well as SiO2, to promote diazodecomposition and subsequent cyclization/rearrangement through a range of mechanistic pathways.
Silica-Supported Silver Nitrate as a Highly Active Dearomatizing Spirocyclization Catalyst: Synergistic Alkyne Activation by Silver Nanoparticles and Silica
作者:Aimee K. Clarke、Michael J. James、Peter O'Brien、Richard J. K. Taylor、William P. Unsworth
DOI:10.1002/anie.201608263
日期:2016.10.24
Silica‐supported AgNO3 (AgNO3–SiO2) catalyzes the dearomatizing spirocyclization of alkyne‐tethered aromatics far more effectively than the analogous unsupported reagent; in many cases, reactions which fail using unsupported AgNO3 proceed effectively with AgNO3–SiO2. Mechanistic studies indicate that this is a consequence of silver nanoparticle formation on the silica surface combined with a synergistic